What is Python frozendict?

Immutable, hashable dict in Python 3.15 . Behaves like dict on reads, preserves order, O(1) lookup.

How do you create a frozendict in Python?

Use `frozendict(key=val)` or `frozendict(existing_dict)`. No `{}` literal.

When is Python 3.15 releasing?

Later 2024; alphas out now for testing.

Python 3.15's Frozendict: Hashable Dicts Arrive at Last

Python's dictionaries are powerhouses — until you need them hashable. Enter frozendict in 3.15: immutable, order-preserving, and ready to unlock new patterns.

theAIcatchup Apr 08, 2026 3 min read

Code snippet creating and using Python frozendict type

⚡ Key Takeaways

Frozendict is immutable, hashable, and preserves dict insertion order for smoothly reads. 𝕏
Superior to collections.frozenmap: builtin, faster lookups, order-aware. 𝕏
Enables nested dicts as keys, boosting functional and config-heavy code. 𝕏

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#Python 3.15 #Python data types #frozendict #hashable dict #immutable dictionary

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Originally reported by InfoWorld

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