mypy

33e35589 - Fix operator error messages for __div__ and __cmp__ on python 2 (#7671)

Fix operator error messages for __div__ and __cmp__ on python 2 (#7671) Currently the code for turning method call errors into operator error messages doesn't detect __div__ and __cmp__, so fix that. One of my main motivations here is that this fixes type ignoring these with an error code, since previously the real error would be `arg-type` but the note would be `operator`.