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a60fb26
(Get the code!)
ah ha!
The difference between the functional-py310 and pep8 testenvs (per tox.ini) is a dep on autopep8, which pulls in 2 other packages[1]: 'toml' (unversioned) and 'pycodestyle >= 2.8.0'.
Modifying tox.ini to remove autopep8 and adding those two back in one at a time reveals that pycodestyle is at fault. Replacing it with unversioned pycodestyle lets the environment generate fine, so it's a problem with the specific version.
After letting the env generate with unversioned pycodestyle, examining it reveals that the flake8 version we're installing (3.8.4) requires[2] 'pycodestyle >= 2.6.0a1, < 2.7.0'. The <2.7.0 part was dropped in flake8 4.0.0.
We can't get flake8 4.0.0 because hacking requires flake8<
On why hacking can't use the newer flake8, found these:
https:/
https:/
Going back to the origin of the problem, the last version that allowed 'pycodestyle >= 2.6.0' (as opposed to 2.7.0 or 2.8.0) was 1.5.5. Pinning autopep8 to that in tox.ini allows the environment to be generated, and pep8 passes to boot.
[1] https:/
[2] https:/