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I’ll make one change before committing:
Lib/test/test_shutil.py:69: if isinstance(path, (list, tuple)):
Using a list for path components does not make sense. I have changed a similar helper function in packaging to allow only tuples.
Petri: these helper functions are all about convenienve. I would reject a patch for a function just doing open+read, but here I think that doing os.path.join+open+read is worth a function. We use such helpers all the time in packaging tests and it helps reducing boilerplate, without being very hard to understand.