PyO3/pyo3

Define C-variadic FFI functions on `nightly` feature

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#5,777 opened on Feb 4, 2026

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FFIGood First Issue

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Description

It struck me that FFI definitions of variadic functions like PyArg_ParseTupleAndKeywords could be implemented with the nightly feature - this would probably be a good way to help the c_variadic feature gain feedback upstream.

Contributor guide

Research direction
Study the Rust `c variadic` feature and design FFI wrappers for variadic Python C API functions like PyArg ParseTupleAndKeywords.
Tech stack
rustcpython
Domain
apibackend
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
RustC
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40