Easy_install would mess up the order of sys.path in develop install

[Plypy]

Environment:

Setuptools 20.6.7
Ubuntu server 14.04 within VirtualBox

Background:

Debian alike has two paths for python packages, one is for packages managed by apt /usr/lib/python*.*/dist-packages/, the other is for packages managed by pip or other 3rd-party software /usr/local/lib/python*.*/dist-packages/. Usually, the latter holds newer packages, so it's placed before the former.

Issue
After performing a python setup.py develop, I found that all projects crashed with something like ImportError. After some research, it seems to me that in develop install easy_setup would add current project's and its dependencies' paths into an easy_setup.pth file in order to modify sys.path. However if a package is located in /usr/lib/python*.*/dist-packages/, easy_setup would still add this path into easy_setup.pth, which would cause this path place prior to /usr/local/lib/python*.*/dist-packages/ and lead those disasters.

My temporary workaround is to move dependencies located in /usr/lib/python*.*/dist-packages/ to /usr/local/lib/python*.*/dist-packages/.

Hope you can fix this, it has spent me lots of time to discover where the problem is.

Regards.

[RonnyPfannschmidt]

im under the impression this is a case of a distribution breaking the worldd