21CTO

Oct 9, 2026 · Industry Insights

Rust Enters CPython: Python 3.16 Adds Optional Rust zlib Backend

Python 3.16 will introduce an optional Rust backend for the zlib module, marking the first Rust code in CPython, with a roadmap to make Rust mandatory by Python 3.18 in 2029, while addressing performance gains, dependency concerns, and success criteria for the Rust for CPython initiative.