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Python identifiers are in NFKC form; string method .isidentifier() returns true on strings that are not in that form. In some contexts, these non-canonical strings will be replaced with their NFKC equivalent, but in other contexts (such as the builtins hasattr, getattr, delattr) they will not.
>>> cha=chr(170)
>>> cha
'a'
>>> cha.isidentifier()
True
>>> uc.normalize("NFKC", cha)
'a'
>>> obj.a = 5
>>> hasattr(obj, "a")
False
>>> obj.a
5