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$ curl repovive.com/roadmaps/python/dictionaries/valid-dictionary-keys

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$ curl repovive.com/roadmaps/python/dictionaries/valid-dictionary-keys

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Valid Dictionary Keys - Dictionaries | Python | Repovive

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Valid Dictionary Keys

Hashable types

Dictionary keys must be hashable (immutable):

Valid keys: strings, numbers, tuples (if contents are hashable)

d = {}
d["name"] = "Alice"      # String key - OK
d[42] = "answer"         # Number key - OK
d[(1, 2)] = "point"      # Tuple key - OK

Invalid keys: lists, dictionaries, sets

d[[1, 2]] = "list"       # Error! Lists can't be keys

Lists are mutable. If a key could change, Python couldn't find it anymore.