python – Pip默认行为与virtualenv冲突？

我正在学习本教程 http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world/page/5

当我得到virtualenv flask命令时,我收到此错误消息：

Can not perform a '--user' install. User site-packages are not visible in this virtualenv.

这是有道理的,因为virtualenv的目的是创建一个你可以控制的新环境,而–user命令将所有东西都放在一个特定的位置,从而破坏了开发环境分离的目标.

看来pip默认为–user安装,我可以更改此默认行为吗？而且,更好的是,我可以随时获得与virtualenv一起玩的好处吗？

为了澄清,这是我的终端的样子.

MELCHIOR:miguelgrinberg-microblog megablanc$virtualenv flask
New python executable in flask/bin/python
Installing setuptools,pip,wheel...
  Complete output from command /Users/megablanc/Dev...log/flask/bin/python -c "import sys,pip; sys...d"] + sys.argv[1:]))" setuptools pip wheel:
  Can not perform a '--user' install. User site-packages are not visible in this virtualenv.
----------------------------------------
...Installing setuptools,wheel...done.
Traceback (most recent call last):
  File "/Users/megablanc/Library/Python/2.7/bin/virtualenv",line 11,in <module>
    sys.exit(main())
  File "/Users/megablanc/Library/Python/2.7/lib/python/site-packages/virtualenv.py",line 832,in main
    symlink=options.symlink)
  File "/Users/megablanc/Library/Python/2.7/lib/python/site-packages/virtualenv.py",line 1004,in create_environment
    install_wheel(to_install,py_executable,search_dirs)
  File "/Users/megablanc/Library/Python/2.7/lib/python/site-packages/virtualenv.py",line 969,in install_wheel
    'PIP_NO_INDEX': '1'
  File "/Users/megablanc/Library/Python/2.7/lib/python/site-packages/virtualenv.py",line 910,in call_subprocess
    % (cmd_desc,proc.returncode))
OSError: Command /Users/megablanc/Dev...log/flask/bin/python -c "import sys,pip; sys...d"] + sys.argv[1:]))" setuptools pip wheel failed with error code 1

解决方法

一旦你的virtualenv被激活,你应该能够毫无问题地推送安装包.例如,pip install numpy.它们将被安装在：lib / python2.6 / site-packages /(对于你正在使用的任何Python版本)

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