PyO3/pyo3

Provide Rust wrappers around PyFrozenDict

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#6,158 opened on Jun 23, 2026

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Description

frozendict has been introduced in Python 3.15 and currently pyo3 only expose PyFrozenDict_New through the ffi module.

I believe it would be interesting to provide at PyFrozenDict struct and a PyFrozenDictMethods trait to allow high level manipulation of object of this type from Rust.

Additionally check methods (PyAnyDict_Check and PyAnyDict_CheckExact) should be exposed in the ffi, like the set counterparts.

I can try to work on that but I would be happy to have some pointers about the best way to attack this.

Contributor guide

Research direction
Examine the existing PyDict wrapper implementation in PyO3 for patterns and adapt them to create PyFrozenDict struct and PyFrozenDictMethods trait. Also expose the check functions in the FFI module.
Tech stack
rustpython
Domain
apideveloper experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70