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https://artofproblemsolving.com/wiki/index.php/Dictionary#:~:text=Dictionaries%20themselves%20are%20mutable%2C%20so,entries%20with%20the%20same%20key. Dictionaries themselves are mutable, so entries can be added, removed, and changed at any time. Note, though, that because entries are accessed by their key, we can't have two entries with the same key.
https://stackoverflow.com/questions/4418741/im-able-to-use-a-mutable-object-as-a-dictionary-key-in-python-is-this-not-disa 12 Dec 2010 — Any object with a __hash__ method can be a dictionary key. For classes you write, this method defaults to returning a value based off id(self), ...