使用brewed python 2.7无法在OS X 10.8中安装virtualenv

Question

当尝试使用brewed python安装virtualenv时,我收到以下错误:

$ pip install virtualenv
Requirement already satisfied (use --upgrade to upgrade): \
  virtualenv in /Library/Python/2.7/site-packages/virtualenv-1.9.1-py2.7.egg
Cleaning up...

所以很明显pip以某种方式查看系统python文件夹而不是/ usr/local中的brewed文件夹.我怎么能避免这个？

brew医生没有发现问题,路径优先级设置正常.

我试图从系统python中删除virtualenv包,所以我可以用brewed pip安装virtualenv.但后来我无法创建virtualenvs,因为我收到了这个错误:

$ virtualenv datatransfer/
Traceback (most recent call last):
  File "/usr/local/bin/virtualenv", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in <module>
    working_set.require(__requires__)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
    raise DistributionNotFound(req)  # XXX put more info here
pkg_resources.DistributionNotFound: virtualenv==1.9.1

所以我没有设法避免系统virtualenv.

我做错了什么？

Answer 1

我遇到了同样的问题,我设法通过卸载任何brew版本的Python和virtualenv来解决它

brew uninstall python
brew uninstall pyenv-virtualenv

手动将我找到的所有virtualenv*文件移动/usr/local/bin到另一个文件夹

sudo mkdir /usr/local/bin/venv-old
sudo mv /usr/local/bin/virtualenv* /usr/local/bin/venv-old/

打开一个新的终端选项卡,然后仔细检查我是否处于干净状态

which python # => /usr/bin/python
which virtualenv # => virtualenv not found

并使用推荐的方法(此处和此处)干净地安装Python和virtualenv(包装器):

brew install python --with-brewed-openssl
# Open a new terminal tab now (to access /usr/local/bin/python)
pip install virtualenv
pip install virtualenvwrapper

Answer 2

我发现与你不同的是，根据酿酒医生的说法，我的道路是错误的。但在更正后，我仍然遇到问题（根据您的描述，这并不奇怪），所以我卸载了 virtualenv 然后重新安装，但这次使用 sudo，sudo pip install virtualenv

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这解决了这个问题，这表明我要么在系统配置上遇到了另一个问题，要么有超过我一小时Python经验的人能够指出为什么它不好（我认为这与全局有关）安装被认为是一种不好的做法）。

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赛斯的观点which似乎与我的观点相同，

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~ which python结果是/usr/local/bin/python

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~ ls -l /usr/local/bin/python给我_permissions_etc_ /usr/local/bin/python -> ../Cellar/python/2.7.5/bin/python

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点

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which pip指向/usr/local/bin/pip

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ls -l /usr/local/bin/pip节目_permissions_etc_ /usr/local/bin/pip -> ../Cellar/python/2.7.5/bin/pip

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Virtualenv（在 sudo pip install 之前没有输出）

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which virtualenv是/usr/local/bin/virtualenv

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ls -l /usr/local/bin/virtualenv节目_permissions_etc_ /usr/local/bin/virtualenv

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当我创建并使用 virtualenv 时，我得到以下信息，

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workon ve_test\nwhich python\n/Users/_username_/.virtualenvs/ve_test/bin/python\n(ve_test)\xe2\x9e\x9c  ~PIP_VIRTUALENV_BASE  python --version\nPython 2.7.5\n

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FWIW 我的 .zshrc 有以下内容，

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# Python related\n# http://hackercodex.com/guide/python-virtualenv-on-mac-osx-mountain-lion-10.8/\n# http://docs.python-guide.org/en/latest/dev/virtualenvs.html\nsource /usr/local/bin/virtualenvwrapper.sh\n# virtualenv should use Distribute instead of legacy setuptools\nexport VIRTUALENV_DISTRIBUTE=true\n# Centralized location for new virtual environments\nexport PIP_VIRTUALENV_BASE=$HOME/Projects/PythonVirtualEnv\n# cache pip-installed packages to avoid re-downloading\nexport PIP_DOWNLOAD_CACHE=$HOME/.pip/cache\n

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