Python’s core developers are weighing a plan to bring Rust into CPython, starting with an optional Rust implementation of zlib and potentially making Rust a required build dependency by 2029. The proposal was one of several substantial topics at the 2026 Python Language Summit in Kraków, whose talk summaries are now available.
Watch Desk analysis
What happened
David Hewitt proposed beginning with an optional Rust version of the zlib module in Python 3.16, with the longer-term goal of requiring Rust to build CPython by Python 3.18 in 2029. Developers discussed practical hurdles, including platform support, Cargo dependency management and API design. These are proposals and discussion, not a confirmed change to Python’s roadmap.
The summit also covered garbage collection, a possible std namespace for the standard library, concurrency improvements to the Python Buffer Protocol, and Spicycrab, a Python-to-Rust transpiler. The Python Language Summit report includes summaries of ten full-length talks and five lightning talks. The event brought 47 core developers and special guests together in Kraków.
Why it matters
Rust becoming part of CPython’s build process would affect contributors, distributors and anyone maintaining Python across different platforms. Starting with an optional module gives developers a possible test case, but the proposal’s longer-term ambition makes compatibility and build tooling central questions, not footnotes.
Our read
This is an early proposal, not a reason to expect tomorrow’s Python installation to come with a Rust-shaped surprise. But it is a consequential conversation about how the language’s core is built and maintained. The useful debate is whether Rust’s potential benefits justify the extra burden on platforms and packagers.
What to watch
- Whether the optional zlib implementation advances towards a concrete Python 3.16 proposal.
- How developers plan to handle Cargo, platform support and build dependencies.
- Whether the summit’s other proposals, including garbage-collection changes, develop into formal plans.
Discussion spark: Would making Rust a required CPython build dependency be a worthwhile trade for potential improvements, or an unnecessary burden for platforms and packagers?
Sources and evidence
- Python holds Language Summit 2026 in Kraków () (30 September 2026, 13:22 UTC)
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