Cannot extract Rust arrray from NumPy array

[adamreichold]

I am getting TypeError: argument 'oned': 'ndarray' object cannot be converted to 'Sequence' running test.py with the following files:

src/lib.rs

use pyo3::prelude::*;

#[pyclass(module = "rust_module")]
#[derive(Default, Debug, serde::Serialize, serde::Deserialize, Clone)]
pub struct DummyClass{
    name: String,
    oned: [f64;3],
    twod: [[f64;3];3],
}

#[pymethods]
impl DummyClass {
    #[new]
    pub fn pynew(
        name: String,
        oned: [f64;3],
        twod: [[f64;3];3],
    ) -> PyResult<Self>{
        Ok(Self { name, oned, twod})
    }

    fn __call__(&self) -> PyResult<String>{
        Ok("Success".into())
    }
}

#[pymodule]
fn pyo3_pure(_py: Python, m: &PyModule) -> PyResult<()> {
    m.add_class::<DummyClass>()?;
    Ok(())
}

Cargo.toml

[package]
name = "reproduce-extract"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
pyo3 = { version = "0.17.2", features = ["serde", "abi3-py37", "extension-module"] }
numpy = { version = "^0.17.2" }
serde = { version = "^1.0", features = ["derive"]}

[lib]
name = "pyo3_pure"
crate-type = ["cdylib"]

pyproject.toml

[build-system]
requires = ["maturin>=0.13,<0.14"]
build-backend = "maturin"

[tool.maturin]
bindings = "pyo3"

[project]
# The name pyo3_pure instead of pyo3-pure is intentional,
# it's used as a crate name resolution regression test
name = "pyo3_pure"
version = "0.1.0"

dependencies = [
    "numpy"
]

test.py

from pyo3_pure import DummyClass
import numpy as np

# test = DummyClass("hello",[0,0,0],[[0,0,0],[0,0,0],[0,0,0]])
test = DummyClass("hello",np.array([0,0,0]),np.array([[0,0,0],[0,0,0],[0,0,0]]))

print(test())

Originally posted by @Billyangnz in #2615 (comment)