python常见问题

`OSError: [Errno 1] Operation not permitted: '/tmp/pip-g3bg0s-uninstall/System/Library/Frameworks/Pyt`

在用下列名字安装时

1 2	sudo -H pip install Scrapy sudo pip install virtualenvwrapper

出现下列错误

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-9.0.1-py2.7.egg/pip/basecommand.py", line 215, in main

    status = self.run(options, args)

  File "/Library/python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/commands/install.py", line 342, in run

    prefix=options.prefix_path,

  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_set.py", line 778, in install

    requirement.uninstall(auto_confirm=True)

  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 754, in uninstall

    paths_to_remove.remove(auto_confirm)

  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_uninstall.py", line 115, in remove

    renames(path, new_path)

  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/utils/__init__.py", line 267, 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-g3bg0s-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'

Scrapy，virtualenvwrapper需要依赖six，在安装six的时候发现系统已经有一个six-1.4.1，但是virtualenvwrapper需要six-1.9.0，于是想先卸载老版本的six，此时问题来了，发现没有权限卸载，此时我就纳闷，加上sudo，还是没权限。于是Google之，最终还是在万能的GitHub找到答案。six-1.4.1是系统内置的packages，因系统集成保护你是没有权限去修改/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info目录的。因此在安装virtualenvwrapper的时候需要选择忽略six的安装：

1 2	sudo pip install virtualenvwrapper --upgrade --ignore-installed six sudo pip install Scrapy --upgrade --ignore-installed six

如果使用requirements安装,也使用:sudo -H pip install -r requirements.txt --upgrade --ignore-installed six