Python pip.req.req_install 模块，InstallRequirement() 实例源码

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 ignore_installed=False, as_egg=False, target_dir=None,
                 ignore_dependencies=False, force_reinstall=False,
                 use_user_site=False, session=None, pycompile=True,
                 isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)

def __init__(self, build_dir, src_dir, download_dir, upgrade=False,
                 upgrade_strategy=None, ignore_installed=False, as_egg=False,
                 target_dir=None, ignore_dependencies=False,
                 force_reinstall=False, use_user_site=False, session=None,
                 pycompile=True, isolated=False, wheel_download_dir=None,
                 wheel_cache=None, require_hashes=False,
                 ignore_requires_python=False):
        """Create a RequirementSet.

        :param wheel_download_dir: Where still-packed .whl files should be
            written to. If None they are written to the download_dir parameter.
            Separate to download_dir to permit only keeping wheel archives for
            pip wheel.
        :param download_dir: Where still packed archives should be written to.
            If None they are not saved, and are deleted immediately after
            unpacking.
        :param wheel_cache: The pip wheel cache, for passing to
            InstallRequirement.
        """
        if session is None:
            raise TypeError(
                "RequirementSet() missing 1 required keyword argument: "
                "'session'"
            )

        self.build_dir = build_dir
        self.src_dir = src_dir
        # XXX: download_dir and wheel_download_dir overlap semantically and may
        # be combined if we're willing to have non-wheel archives present in
        # the wheelhouse output by 'pip wheel'.
        self.download_dir = download_dir
        self.upgrade = upgrade
        self.upgrade_strategy = upgrade_strategy
        self.ignore_installed = ignore_installed
        self.force_reinstall = force_reinstall
        self.requirements = Requirements()
        # Mapping of alias: real_name
        self.requirement_aliases = {}
        self.unnamed_requirements = []
        self.ignore_dependencies = ignore_dependencies
        self.ignore_requires_python = ignore_requires_python
        self.successfully_downloaded = []
        self.successfully_installed = []
        self.reqs_to_cleanup = []
        self.as_egg = as_egg
        self.use_user_site = use_user_site
        self.target_dir = target_dir  # set from --target option
        self.session = session
        self.pycompile = pycompile
        self.isolated = isolated
        if wheel_download_dir:
            wheel_download_dir = normalize_path(wheel_download_dir)
        self.wheel_download_dir = wheel_download_dir
        self._wheel_cache = wheel_cache
        self.require_hashes = require_hashes
        # Maps from install_req -> dependencies_of_install_req
        self._dependencies = defaultdict(list)