No way to give Rust and Python project a different name.

[flying-sheep]

Bug Description

Apologies if there is a way, I searched for quite a while and didn’t find it.

I want to create a crate that is also deployed to PyPI.

On crates.io, it has the name xdot (already published), on PyPI it’s supposed to have the name xdot-rs (and be importable as import xdot_rs)

This doesn’t seem to be possible as [tool.maturin] doesn’t seem to have an option for this, and when just using the intended names, maturin complains:

⚠️ Warning: Couldn't find the symbol PyInit_xdot in the native library. Python will fail to import this module. If you're using pyo3, check that #[pymodule] uses xdot as module name

This advice isn’t actionable, since I can neither use xdot as Python package name (it already exists) nor am I able (or want to) rename the Rust crate to xdot-rs.

Your maturin version (maturin --version)

0.14.15

Your Python version (python -V)

3.10.9

Your pip version (pip -V)

23.0.1

What bindings you're using

pyo3

Does cargo build work?

• Yes, it works

Steps to Reproduce

Cargo.toml

[package]
name = 'xdot'
...

[dependencies]
...
pyo3 = { version = '0.18.1', optional = true, features = ['extension-module']}

pyproject.toml

[build-system]
...
[project]
name = 'xdot-rs'
...
[tool.maturin]
features = ['pyo3']

src/lib.rs

...

#[cfg(feature = "pyo3")]
#[pyo3::pymodule]
#[pyo3(name = "xdot_rs")]
pub fn pymodule(py: pyo3::Python, m: &pyo3::types::PyModule) -> pyo3::PyResult<()> {
    ...
    Ok(())
}

[messense]

Have you tried

[package.metadata.maturin]
name = "xdot_rs"

?

The module name has to be aligned with the dylib name which defaults to package.name in Cargo.toml and can be override with package.metadata.maturin.name.

[flying-sheep]

This kinda works, but the python module included in the .whl is named xdot.

[messense]

The configuration is very likely going to be changed in #1493 (comment).

[messense]

It would be helpful if you can provide a git repo for repro.

[flying-sheep]

sure, can do.

[flying-sheep]

Here you go: https://github.com/flying-sheep/maturin-names-reproducer

I’m not sure if I understand the purpose of all the names completely, but the point is that the generated python package has the rust crate name still (and is broken as it does from .<rust crate name> import * instead of from .<dylib name> import *)