I like __fspath__ because it looks like os.fsencode() and os.fsdecode(). Please no builtin function, we have enough of them, but make sure that the __fspath__ is accepted in all functions expecting a filename.
If you consider that a function would make your change simpler, I suggest to add os.fspath(): if isinstance(obj, str): return obj try: return obj.__fspath__ except AttributeError: raise TypeError(...) Victor
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