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What are mutable and immutable types in Python?

Q: What are mutable and immutable types in Python?

**Immutable** types (int, float, str, tuple, frozenset) can't be changed after creation — operations return new objects. **Mutable** types (list, dict, set) can be modified in place. This affects function arguments (mutable defaults are shared) and dict-key eligibility (only hashable/immutable).

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Explain mutability.

mutability

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Immutable types (int, float, str, tuple, frozenset) can't be changed after creation — operations return new objects. Mutable types (list, dict, set) can be modified in place. This affects function arguments (mutable defaults are shared) and dict-key eligibility (only hashable/immutable).

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PYIdentity proves in-place mutation vs rebinding

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