DeprecationWarning with the latest setuptools

Starting with setuptools==60.0.0 there’s a DeprecationWarning for distutils version classes: https://github.com/pypa/setuptools/commit/1701579e0827317d8888c2254a17b5786b6b5246

This leads to a warning in seaborn:

$ pip install -U 'setuptools>=60' seaborn
$ python -We -c 'import seaborn'         
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/venv/lib/python3.7/site-packages/seaborn/__init__.py", line 2, in <module>
    from .rcmod import *  # noqa: F401,F403
  File "/venv/lib/python3.7/site-packages/seaborn/rcmod.py", line 82, in <module>
    if LooseVersion(mpl.__version__) >= "3.0":
  File "/venv/lib/python3.7/site-packages/setuptools/_distutils/version.py", line 57, in __init__
    stacklevel=2,
DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.

I see that this has probably been fixed by #2466 on master. But this change hasn’t been released yet. Maybe this can be a reason to realease a new patch version sooner than later? Unfixable warnings can have an impact on many CI/CD setups.

[Stannislav]

Hey @mwaskom, sounds like a great idea. I’ll try and look into this soon.

[mwaskom]

Sorry for the runaround on this one, by the time the backport landed it felt like v0.12 was close to release, but then that process really ended up dragging out. In any case, v0.12.0 is out and so there should be no further warnings about distutils.