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Dictionary - Art of Problem Solving

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.

Why must dictionary keys be immutable? - effbot.org

http://effbot.org/pyfaq/why-must-dictionary-keys-be-immutable.htm The hash table implementation of dictionaries uses a hash value calculated from the key value to find the key. If the key were a mutable object, its value could ...

Difference between Mutable and Immutable in Python

http://net-informations.com/python/iq/immutable.htm Mutable vs Immutable Objects in Python - An object's mutability is determined by its type. Some of these objects like lists and dictionaries are mutable, meaning ...
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