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docs(python): clarify when tuples can be dictionary keys - #10451
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jcanalesluna merged 1 commit intoOct 15, 2026
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The Python tuples topic currently implies that immutability makes every tuple a valid dictionary key. A tuple containing a list is a counterexample:
{([1, 2],): "value"}raisesTypeError: unhashable type: 'list'.Clarify that all tuple elements must be hashable before the tuple can be used as a key. This follows the Python glossary and avoids a misleading rule for learners.
Validation: ran Python 3.12 examples with ordinary and nested hashable tuples, plus tuples containing lists directly and indirectly. Checked the Markdown structure and existing resource links; only the explanatory sentence changes.
AI assistance: OpenAI Codex assisted with investigation, editing, and verification.