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Pip==6.0.6 not finding previous package versions, yet Pip==1.5.6 does

Specifically, when trying to install Jinja2==2.6 with pip v6.0.6 (within virtualenv), I get this error

(venv) $ pip show pip
Name: pip
Version: 6.0.6
Location: path..
Requires: 

(venv) $ pip install Jinja2==2.6
Collecting Jinja2==2.6
Could not find a version that satisfies the requirement Jinja2==2.6 (from versions: 2.7.3)
No distributions matching the version for Jinja2==2.6

Yet when I use pip v1.5.6 (system pip - /usr/local/bin/pip), it finds and installs the package just fine. Why is that?

(venv) $ /usr/local/bin/pip install Jinja2==2.6
...success

pip 6.0.6 also produces the same error when trying to install any previous version of ANY package.

Solution

  • Found the problem. I had previously changed my pip.conf file to search for packages in a private location. Still not sure why this didn't raise errors with pip 1.5.6 though.