Release process creates a dist/*.egg file

[hugovk]

What did you do?

Ran make release-test as part of the 8.0.0 release checks.

What did you expect to happen?

Release tests ran. Nothing created in dist/

What actually happened?

Release tests ran. dist/Pillow-8.1.0.dev0-py3.9-macosx-10.9-x86_64.egg was created.

What are your OS, Python and Pillow versions?

• OS: macOS Mojave
• Python: 3.9
• Pillow: 8.0.0

This comes from the python3 setup.py install command. I moved the file away before proceeding, to make sure it wasn't uploaded to PyPI as there wasn't one for the last release:

• https://pypi.org/project/Pillow/7.2.0/#files

But now I look again, these have a single egg:

Release	egg
https://pypi.org/project/Pillow/7.1.2/#files	Pillow-7.1.2-py3.8-macosx-10.9-x86_64.egg
https://pypi.org/project/Pillow/7.1.1/#files	Pillow-7.1.1-py3.8-macosx-10.9-x86_64.egg
https://pypi.org/project/Pillow/7.1.0/#files	Pillow-7.1.0-py3.8-macosx-10.9-x86_64.egg

We don't need to release a single egg file for a single Python version, right? When we have all the wheels?

If we don't need it, can we prevent python3 setup.py install creating it, or alternatively, update RELEASING.md to remove it?

[radarhere]

See pypa/setuptools#1347 for the setuptools issue about this.

See #4990 for my suggested solution - a PR that removes the egg file after make release-test.