我正在尝试通过 pip 在 OSX 10.11 (El Capitan) 中安装 Scrapy Python 框架。安装脚本下载所需的模块，并在某些时候返回以下错误：

OSError: [Errno 1] Operation not permitted: '/tmp/pip-nIfswi-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'

我尝试使用以下命令停用 OSX 10.11 中的无根功能：

sudo nvram boot-args="rootless=0";sudo reboot

但是当机器重新启动时我仍然得到同样的错误。

我的 StackExchangers 同事有什么线索或想法吗？

如果有帮助，完整的脚本输出如下：

sudo -s pip install scrapy
Collecting scrapy
  Downloading Scrapy-1.0.2-py2-none-any.whl (290kB)
    100% |████████████████████████████████| 290kB 345kB/s 
Requirement already satisfied (use --upgrade to upgrade): cssselect>=0.9 in /Library/Python/2.7/site-packages (from scrapy)
Requirement already satisfied (use --upgrade to upgrade): queuelib in /Library/Python/2.7/site-packages (from scrapy)
Requirement already satisfied (use --upgrade to upgrade): pyOpenSSL in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from scrapy)
Collecting w3lib>=1.8.0 (from scrapy)
  Downloading w3lib-1.12.0-py2.py3-none-any.whl
Collecting lxml (from scrapy)
  Downloading lxml-3.4.4.tar.gz (3.5MB)
    100% |████████████████████████████████| 3.5MB 112kB/s 
Collecting Twisted>=10.0.0 (from scrapy)
  Downloading Twisted-15.3.0.tar.bz2 (4.4MB)
    100% |████████████████████████████████| 4.4MB 94kB/s 
Collecting six>=1.5.2 (from scrapy)
  Downloading six-1.9.0-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): zope.interface>=3.6.0 in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from Twisted>=10.0.0->scrapy)
Requirement already satisfied (use --upgrade to upgrade): setuptools in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from zope.interface>=3.6.0->Twisted>=10.0.0->scrapy)
Installing collected packages: six, w3lib, lxml, Twisted, scrapy
  Found existing installation: six 1.4.1
    DEPRECATION: Uninstalling a distutils installed project (six) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
    Uninstalling six-1.4.1:
Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/basecommand.py", line 223, in main
status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/commands/install.py", line 299, in run
root=options.root_path,
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/req/req_set.py", line 640, in install
requirement.uninstall(auto_confirm=True)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/req/req_install.py", line 726, in uninstall
paths_to_remove.remove(auto_confirm)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/req/req_uninstall.py", line 125, in remove
renames(path, new_path)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/utils/__init__.py", line 314, in renames
shutil.move(old, new)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 302, in move
copy2(src, real_dst)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 131, in copy2
copystat(src, dst)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
os.chflags(dst, st.st_flags)
OSError: [Errno 1] Operation not permitted: '/tmp/pip-nIfswi-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'