Error when running 'pip install -r requirements.txt --upgrade'

Question

When i run following command in my Django project:

pip install -r requirements.txt --upgrade

I get following error:

Answer 1

If you're using a virtualenv, this shouldn't happen,if it does, then here is a similar question to your problem.

OS X Uninstall a distutils installed project

If you do remove the argparse package, it can be installed again using pip.

Don't have enough reputation to write this as a comment yet. :(

Answer 2

This sounds very much like you are hitting https://github.com/pypa/pip/issues/3384 - the temporary solution is to pin pip<8