Unable to install any package through pip

Question

For some reason I have issues installing new packages with my pip. I have an OS Sierra environment and everything was working fine before. Now either I use a virtualenv or n

Answer 1

The solution proposed by user1919 helped me to resolve installation of tox on lxc ubuntu container as the defualt pip version 8 doesn't recognize the correct url

I used:

pip install -v tox -i https://pypi.python.org/simple/
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Successfully installed filelock-3.0.10 pluggy-0.9.0 py-1.8.0 setuptools-40.8.0 toml-0.10.0 tox-3.7.0 virtualenv-16.4.3