pip: Can't uninstall packages installed with `-e`, or when providing a directory name

This seems to he the same as #1895 which was closed without steps to reproduce. edit this is a duplicate of #4431

When installing packages using -e, you can’t uninstall them using pip, you just get Can’t uninstall python-jsonstore. No files were found to uninstall.

To reproduce in Docker: docker pull ubuntu:16.04 && docker run -it --rm ubuntu:16.04

apt-get update --yes
apt-get install --yes git python python-pip
pip install --upgrade pip==9.0.1
git clone -b 1.0.0 https://github.com/Code0x58/python-jsonstore.git
pip install -e python-jsonstore/
pip uninstall python-jsonstore

The error message comes up when trying to uninstall the package name, but there is nothing if you uninstall the directory - either way the module remains installed as python -m jsonstore.tests runs.

Running with -v shows it falls through to this branch, where dist.location is the directory given to pip install -e.

It is probably a separate issue that you don’t get output (or a return code) when trying to uninstall a package that was installed from a directory - it should work or raise an exception like when you give a bad package name to uninstall.