带有install_requires的setup.py开发会将dist-packages放在virtualenv的sys.path顶部

Question

I have a directory ~/foo and all it has is setup.py which contains:

from setuptools import setup, find_packages
setup(
    name='foo',
    version='0.1',
    packages=find_packages(),
    install_requires=['mock']
)

Now, I create a virtual environment using:

cd ~
virtualenv --system-site-packages v1

And doing ~/v1/bin/python -c "import sys; print sys.path" , I get

['',
 '/home/garrett',
 '/home/garrett/v1/lib/python2.7',
 '/home/garrett/v1/lib/python2.7/plat-x86_64-linux-gnu',
 '/home/garrett/v1/lib/python2.7/lib-tk',
 '/home/garrett/v1/lib/python2.7/lib-old',
 '/home/garrett/v1/lib/python2.7/lib-dynload',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/home/garrett/v1/local/lib/python2.7/site-packages',
 '/home/garrett/v1/lib/python2.7/site-packages',
 '/usr/local/lib/python2.7/site-packages',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/PILcompat',
 '/usr/lib/python2.7/dist-packages/gtk-2.0',
 '/usr/lib/pymodules/python2.7',
 '/usr/lib/python2.7/dist-packages/ubuntu-sso-client']

but, when I do

sudo pip install mock
cd ~/foo
~/v1/bin/python setup.py develop

then setuptools changes my virtualenv's sys.path to have dist-packages (where mock lives) near the top. Ie, the first 3 entries of sys.path become:

['',
 '/usr/local/lib/python2.7/dist-packages',
 '/home/garrett/foo',
 ...

This seems intentional from looking at the source which modifies easy-install.pth .

Question

Is there anyway to disable it messing with the position of dist-packages in my sys.path ? My dist-packages directory has other modules in it which are been given unwanted precedence.

Answer 1

不确定这是否是最佳解决方案，但是阻止setuptools赋予dist_packages更高优先级的一种方法是添加--always-copy标志。

~/v1/bin/python setup.py develop --always-copy