[Python] pip3 on python3.9 fails on 'HTMLParser' object has no attribute 'unescape' [duplicate]

After installing (ubuntu) python3.9, installing some packages with pip failes on:

Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 14, in <module>
from setuptools.dist import Distribution, Feature
File "/usr/lib/python3/dist-packages/setuptools/dist.py", line 24, in <module>
from setuptools.depends import Require
File "/usr/lib/python3/dist-packages/setuptools/depends.py", line 7, in <module>
from .py33compat import Bytecode
File "/usr/lib/python3/dist-packages/setuptools/py33compat.py", line 54, in <module>
unescape = getattr(html, 'unescape', html_parser.HTMLParser().unescape)
AttributeError: 'HTMLParser' object has no attribute 'unescape'
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

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