Used for questions related to the Rust library pyo3.
pyo3 is a Rust library that provides bindings for Python.
Questions tagged [pyo3]
60 questions
2
votes
1 answer
PyO3 - Deriving FromPyObject for Enums
I'm trying to build a Python package from Rust using PyO3 (version: 0.13.2). Right now I'm stuck trying to get the conversion working for enums. I have a simple enum like so:
#[derive(FromPyObject)]
#[derive(Copy,Clone,PartialEq,Eq)]
enum Direction…
xjvr
- 23
- 4
2
votes
1 answer
Pass list of lists as argument to Rust from Python using PyO3
I'm trying to pass a list of lists from Python to Rust using Py03. The function I'm trying to pass it to has this signature:
pub fn k_nearest_neighbours(k: usize, x: &[[f32; 2]], y: &[[f32; 3]]) -> Vec>
I'm writing bindings for a…
Casper S
- 78
- 7
2
votes
0 answers
How can I make a Rust struct that modifies its own value in a different thread?
I'm making a Python module, written in Rust, using pyo3, that will:
Run its own thread
Read an input pin on a Raspberry Pi, counting how many times the state changes
Let Python query the counter
So far, my code looks like this:
use…
John
- 1,257
- 11
- 28
2
votes
1 answer
Rust Numpy library - iterate by rows: unable to build a NpySingleIterBuilder::readwrite that returns rows instead of single values
I am trying to iterate by rows over a Numpy Array. The array is accessed thru PyO3 and I think the library acess to the underlying C object just fine but I can't seem to find the reference for a more complex SingleIteratorBuilder that helps me…
Matteo Montanari
- 33
- 6
2
votes
1 answer
TypeError in Python using PyAny in reflected numeric emulator (e.g. __radd__) for a Rust pyo3 pyclass struct
I've created a Rust library for python using pyo3. This contains a pyclass struct that implements several of PyNumberProtocol methods like __add__, __sub__, etc... to allow python operators like + and - to work on the class. I'm using PyAny as the…
Jules SJ
- 134
- 5
2
votes
1 answer
PyO3 - passing class extending another class as a function argument
I have a library in Rust and I want to be able to use it from Python. So I can do the bindings using PyO3.
Let's suppose that I have a following library in Rust:
pub trait Animal {
fn make_sound();
}
pub struct Dog {}
impl Animal for Dog {
…
Damian
- 116
- 9
2
votes
0 answers
How is memory managed with &str and String, native types and PyResult when passing values from Rust to Python?
Using PyO3, I am able to pass &str and String types from Rust to Python:
#[pyfunction]
fn test_str(py: Python) -> &str {
"this is a &str"
}
#[pyfunction]
fn test_string(py: Python) -> String {
"this is a String".to_string()
}
And Python is…
user655321
- 1,148
- 2
- 11
- 22
2
votes
1 answer
Cross-compiling (unixlike to windows) with PyO3 and Maturin
I'm wondering if anyone has experience with cross-compiling to windows with pyo3 and maturin.
The pyo3 docs say:
Cross compiling PyO3 modules is relatively straightforward and
requires a few pieces of software:
A toolchain for your target. The…
Jasper
- 1,153
- 1
- 9
- 13
2
votes
1 answer
Passing Python Object Into Rust
I am trying to pass a Python object into rust and perform operations using the fields of the Python object.
Python:
class myclass(object):
def __init__(self):
self.a = 3
b = myclass()
print(b.a)
// 3
Rust:
#[pyfn(m, "rust_obj")]
fn…
grayfox57
- 21
- 1
2
votes
1 answer
Garbage collection for vector of object in PyO3
I have 2 pyclasses Block and BlockGroup.
#[pyclass]
struct Block {
start: i32,
stop: i32,
}
#[pyclass]
struct BlockGroup {
blocks: Vec
}
I'm new to PyO3 and I have read the documentation about garbage collection but I don't…
kentwait
- 1,643
- 2
- 19
- 38
1
vote
1 answer
How to call Python async function from Rust?
I have read this answer(How to call Rust async method from Python?) and what I want to do is the opposite of this.
I want to call a Python async function and await it in tokio's runtime. Is it possible?
I have given it some tries but I am facing an…
Sanskar Jethi
- 362
- 2
- 8
1
vote
1 answer
How to pass an async function as a parameter in Rust PyO3
When we write vanilla rust and we have to pass in an async function as an argument to another function we do the following:
pub f(
test: &dyn Fn(&'a mut String, String, String, TcpStream) -> F,
) where
F: Future
Sanskar Jethi
- 362
- 2
- 8
1
vote
0 answers
Rust pyo3: Any way to pass argument to pyfunction by reference?
fn gen_data<'py> (py: Python<'py>, a: Vec, b: Vec) -> PyResult<&'py PyBytes>{
let dp = MyDataStruct {
data: Bytes::from(a),
extra_info: Bytes::from(b),
};
Ok(PyBytes::new(py,…
Li haonan
- 490
- 1
- 4
- 22
1
vote
0 answers
How to make a Python "rust-Extension" module that behaves exactly like C-Extensions in terms of call overhead and processing speed?
The closer option I have found is pyo3, but it isn't clear to me if it adds any extra overhead when compared to the traditional C-extensions.
From here it seems like such C-extension behavior is possible through borrowed objects (I still have to…
olyk
- 409
- 3
- 10
1
vote
1 answer
How can I convert PyArray into Vec> in Rust
I am using the numpy crate in Rust to work with 2D arrays that come from python. PyArray (https://docs.rs/numpy/0.11.0/numpy/array/struct.PyArray.html) implements a from_vec2() function, which converts a Vec> into a PyArray (2D…
Yaxlat
- 415
- 1
- 6
- 18