pip uninstall does not remove *-nspkg.pth for packages installed in editable mode

[sbidoul]

• Pip version: 9.0.1
• Setuptools version: >= 31.0.0
• Python version: 2.7
• Operating System: Any (tested on Linux)

Description:

pip uninstall does not remove *-nspkg.pth for packages installed in editable mode.

What I've run:

I have a package a1 which declares a namespace package.

pip install -e a1/ creates a1-nspkg.pth in site-packages as well as a1.egg-link.

pip uninstall a1 removes a1.egg-link but leaves a1-nspkg.pth behind.

See also

• pip uninstall does not remove *-nspkg.pth for packages installed in editable mode setuptools#907
• develop and install --single-version-externally-managed are not compatible with each other for namespace packages setuptools#250 (comment)

[dstufft]

Duplicate of #4176.