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pip install does not remove previous egg/dist info.

See original GitHub issue

Let me describe this. make a virtualenv

# virtualenv venv
# source venv/bin/activated
# pip list

pip (1.5.6)
setuptools (3.6)
wsgiref (0.1.2)

install a package

# pip install jinja2==2.7.3
# pip list

Jinja2 (2.7.3)
MarkupSafe (0.23)
pip (1.5.6)
setuptools (3.6)
wsgiref (0.1.2)

install another version

# pip install jinja2==2.7.1
# pip list

Jinja2 (2.7.1)
MarkupSafe (0.23)
pip (1.5.6)
setuptools (3.6)
wsgiref (0.1.2)

it’s ok till now. but there exists two egg info.

# ls venv/lib/python2.7/site-packages/Jinja2-*

venv/lib/python2.7/site-packages/Jinja2-2.7.1-py2.7.egg-info
venv/lib/python2.7/site-packages/Jinja2-2.7.3-py2.7.egg-info

try install another version

# pip install jinja2==2.8
# pip list

Jinja2 (2.7.1)
MarkupSafe (0.23)
pip (1.5.6)
setuptools (3.6)
wsgiref (0.1.2)

something is wrong, we expect version 2.8, but it’s 2.7.1 here. check the egg/dist info:

# ls venv/lib/python2.7/site-packages/Jinja2-*

venv/lib/python2.7/site-packages/Jinja2-2.7.1-py2.7.egg-info
venv/lib/python2.7/site-packages/Jinja2-2.7.3-py2.7.egg-info
venv/lib/python2.7/site-packages/Jinja2-2.8.dist-info

it seems pip get the least version from these egg/dist infos. the I upgrade setuptools:

# pip install --upgrade setuptools
# pip list

Jinja2 (2.7.1)
MarkupSafe (0.23)
pip (1.5.6)
setuptools (18.3.1)

it seems ok. but there still exists two version dist infos.

# ls venv/lib/python2.7/site-packages/setuptools-*

venv/lib/python2.7/site-packages/setuptools-18.3.1.dist-info
venv/lib/python2.7/site-packages/setuptools-3.6.dist-info

actually, I found that pip use the first found(least version sort just by dict order) egg/dist info’s version for displaying.

pip should remove previous(others except current installed one) egg/dist infos or change a way to get the current package version or there is some options I don’t know.

It makes me mad!!