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https://artofproblemsolving.com/wiki/index.php/Dictionary#:~:text=Values%20can%20be%20any%20type,and%20changed%20at%20any%20time. Values can be any type of object, but keys must be immutable. This means keys could be integers, strings, or tuples, but not lists, because lists are mutable. Dictionaries themselves are mutable, so entries can be added, removed, and changed at any time.
http://net-informations.com/python/iq/immutable.htm Everything in Python is an object . Some of these objects like lists and dictionaries are mutable, meaning you can change their content without changing their identity. ... Other objects like integers, floats, strings and tuples are objects that can not be changed.