PyO3/pyo3

Define C-variadic FFI functions on `nightly` feature

Open

#5,777 opened on Feb 4, 2026

View on GitHubContributor guide
 (0 comments) (0 reactions) (0 assignees)Rust (668 forks)batch import
FFIGood First Issue

Repository metrics

Stars
 (10,152 stars)
PR merge metrics
 (Avg merge 9d 18h) (51 merged PRs in 30d)

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