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May 18, 2025
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gh-134114: Clarify FAQ note about dictonary keys #134118

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6 changes: 4 additions & 2 deletions Doc/faq/design.rst
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Expand Up @@ -422,8 +422,10 @@ two to the directory.

Tuples are immutable, meaning that once a tuple has been created, you can't
replace any of its elements with a new value. Lists are mutable, meaning that
you can always change a list's elements. Only immutable elements can be used as
dictionary keys, and hence only tuples and not lists can be used as keys.
you can always change a list's elements. Only hashable objects can be used as
dictionary keys. Most immutable types are hashable, which is why tuples, but
not lists, can be used as keys. Note, however, that a tuple is only hashable
if all of its elements are hashable.


How are lists implemented in CPython?
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