Can't install under python 3.14 with/without free thread.

[niebaopeng]

Bug Description

× Preparing metadata (pyproject.toml) did not run successfully.
│ exit code: 1
╰─> [7 lines of output]
📦 Including license file LICENSE
🔗 Found pyo3 bindings
💥 maturin failed
Caused by: Python interpreter should be a kind of interpreter (e.g. 'python3.8' or 'pypy3.9') when cross-compiling, got path to interpreter: /home/nieba/下载/fastapi_example/venv/bin/python3
Error running maturin: Command '['maturin', 'pep517', 'write-dist-info', '--metadata-directory', '/tmp/pip-modern-metadata-ehyivbu5', '--interpreter', '/home/nieba/下载/fastapi_example/venv/bin/python3']' returned non-zero exit status 1.
Checking for Rust toolchain....
Running maturin pep517 write-dist-info --metadata-directory /tmp/pip-modern-metadata-ehyivbu5 --interpreter /home/nieba/下载/fastapi_example/venv/bin/python3
[end of output]
it can read python3.14 or 3.14t or something like that

Your maturin version (maturin --version)

unknown

Your Python version (python -V)

3.14 and 3.14t

Your pip version (pip -V)

newest

What bindings you're using

pyo3

Does cargo build work?

• Yes, it works

If on windows, have you checked that you aren't accidentally using unix path (those with the forward slash /)?

• Yes

Steps to Reproduce

1. use python 3.14 with or without freethread & venv
2. install fastapi[standard]
3. as a dependency, it failed there

[konstin]

I can install fastapi[standard] on Python 3.14 without problems, can you provide a minimal reproducible example - including the platform you're on - and the full logs?