I'm not a Python contributor but I have a question which (I believe) can be answered here, so I've subscribed.

The question is at stackoverflow: https://stackoverflow.com/questions/64912716/are-pre-commit-hooks-clonable

After some research the only thing similtar to a git pre-commit hook I could find on the cpython repo was the patchcheck.py script on github.com/python/cpython/tree/master/Tools/scripts (patchcheck.py), which runs in Travis.