Python __future__ 模块，_Feature() 实例源码

def is_future_feature(object):
    """
    Return True if C{object} results from a C{from __future__ import feature}
    statement.
    """
    # Guard from unexpected implementation changes of the __future__ module.
    global __future_check_works
    if __future_check_works is not None:
        if __future_check_works:
            import __future__
            return isinstance(object, __future__._Feature)
        else:
            return False
    else:
        __future_check_works = True
        try:
            return is_future_feature(object)
        except:
            __future_check_works = False
            log.warning("Troubles inspecting __future__. Python implementation"
                        " may have been changed.")
            return False

def testAllExported(self):
    """Test that all public attributes not imported are in __all__."""
    missing_attributes = []
    for attribute in dir(self.MODULE):
      if not attribute.startswith('_'):
        if attribute not in self.MODULE.__all__:
          attribute_value = getattr(self.MODULE, attribute)
          if isinstance(attribute_value, types.ModuleType):
            continue
          # pylint: disable=protected-access
          if isinstance(attribute_value, __future__._Feature):
            continue
          missing_attributes.append(attribute)
    if missing_attributes:
      self.fail('%s are not modules and not defined in __all__.' %
                missing_attributes)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)

def test_names(self):
        # Verify that all_feature_names appears correct.
        given_feature_names = features[:]
        for name in dir(__future__):
            obj = getattr(__future__, name, None)
            if obj is not None and isinstance(obj, __future__._Feature):
                self.assertTrue(
                    name in given_feature_names,
                    "%r should have been in all_feature_names" % name
                )
                given_feature_names.remove(name)
        self.assertEqual(len(given_feature_names), 0,
               "all_feature_names has too much: %r" % given_feature_names)