python setup.py install --user breaks behaviour of other setups.

[srgvg]

I installed gandi.cli from the repo code (python setup.py install --user) today, as I got bitten by some bugs in 0.16. It seems this had the side effect of updating following file with following content:

~  cat ./.local/lib/python2.7/site-packages/easy-install.pth
import sys; sys.__plen = len(sys.path)
./gandi.cli-0.16-py2.7.egg
/usr/lib/python2.7/dist-packages
import sys; new = sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p = getattr(sys, '__egginsert', 0); sys.path[p:p] = new; sys.__egginsert = p + len(new)

Which breaks at least one script where I need a particular directory added to PYTHONPATH, whilst it at run time gets prepended by the dirs added by the gandi.cli setup:

~  echo $PYTHONPATH
/home/serge/src/ansible/ansible/lib:
~ python
>>> import sys; print(sys.path) 
['', '/home/serge/.local/lib/python2.7/site-packages/gandi.cli-0.16-py2.7.egg', '/usr/lib/python2.7/dist-packages', '/home/serge/src/ansible/ansible/lib', '/home/serge', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/home/serge/.local/lib/python2.7/site-packages', '/home/serge/.local/lib/python2.7/site-packages', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PILcompat', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/wx-2.8-gtk2-unicode']

Is this apparent cause indeed related to my sys.path problem, and did I do something wrong here, or is this a problem with with the gandi.cli setup?