What is “pkg-resources==0.0.0” in output of pip freeze command

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According to https://github.com/pypa/pip/issues/4022, this is a bug resulting from Ubuntu providing incorrect metadata to pip. So, no there does not seem to be a good reason for this behaviour. I filed a follow-up bug with Ubuntu. https://bugs.launchpad.net/ubuntu/+source/python-pip/+bug/1635463

To backup the previous answer, it should be safe to remove that line from your requirements.txt. Here is an example Make file stanza that safely freezes your package list (drop in your Makefile and run with make freeze):

freeze:
    pip freeze | grep -v "pkg-resources" > requirements.txt

edit 2022 July 06:

I have been informed that the package name differs depending on the system in use (pkg-resources vs pkg_resources). Please see the comments attached to this answer for differences in usage between different versions of Debian/Ubuntu. As pkg-resources is the historically correct package name at the time this was posted (almost 6 years ago) for the system in question, it will remain unchanged in this answer.

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