fromkeys method of collection.ChainMap has vararg argument kind. Description of 'fromkeys' method and redirection to dict.fromkeys implies that there should be single value (positional only or keyword ...
Python 3.12.5 (tags/v3.12.5:ff3bc82, Aug 6 2024, 20:45:27) [MSC v.1940 64 bit (AMD64)] on win32 ...