安装在Python 3.3 venv中分发(OS X/Homebrew)

Question

我一直试图在我的OS X机器上运行Python 3.3的内置"venv"模块.我使用Homebrew安装了Python 3.3.

根据文档,创建和切换虚拟环境的工作方式与您期望的一样:

$ python3 -m venv myvenv
$ source myvenv/bin/activate

我测试过这样的东西:

$ echo "YEAH = 'YEAH!'" > myvenv/lib/python3.3/site-packages/thingy.py
$ python
>>> import thingy
>>> print(thingy.YEAH)
'YEAH!'

但是当我尝试安装分发时,它根本就不会进入正确的位置.出于某种原因,它坚持尝试安装到/usr/local/lib/python3.3/site-packages/,但失败时出现以下消息:

No setuptools distribution found
running install
Checking .pth file support in /usr/local/lib/python3.3/site-packages/
/Users/victor/myvenv/bin/python -E -c pass
TEST FAILED: /usr/local/lib/python3.3/site-packages/ does NOT support .pth files
error: bad install directory or PYTHONPATH

You are attempting to install a package to a directory that is not
on PYTHONPATH and which Python does not read ".pth" files from.  The
installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

    /usr/local/lib/python3.3/site-packages/

and your PYTHONPATH environment variable currently contains:

    ''

无论我是否尝试distribute_setup.py直接使用或使用源代码分发,都会发生这种情况.我甚至尝试过使用--prefix=/Users/victor/myenv但它仍然试图将所有内容都放在我的"全局"网站包中.

我无法弄清楚为什么会发生这种情况,但它在我的两台机器上都是一致的.请注意,sys.prefix报告正确的路径(虚拟环境).

这是Homebrew的问题吗？OS X？Python 3.3？VENV？我？

Answer 1

是的，这一直是 Homebrew 的问题，但自https://github.com/mxcl/homebrew/commit/0b50110107ea2998e65011ec31ce45931b446dab以来它现在正在工作。

$ brew update
$ brew rm python3  #if you have installed it before
$ brew install python3
$ cd /tmp
$ which python3
  /usr/local/bin/python3
$ python3 -m venv myvenv 
$ source myvenv/bin/activate
$ wget http://python-distribute.org/distribute_setup.py  # may need brew install wget
$ python3 distribute_setup.py  
  ...
  Finished processing dependencies for distribute==0.6.45
  After install bootstrap.
  Creating /private/tmp/myvenv/lib/python3.3/site-packages/setuptools-0.6c11-py3.3.egg-info
  Creating /private/tmp/myvenv/lib/python3.3/site-packages/setuptools.pth

您会看到已成功将安装分发到 /tmp 目录中。