Struct PyWarning 

pub struct PyWarning(/* private fields */);

Represents Python’s Warning exception.

Example: Raising Warning from Rust

This exception can be sent to Python code by converting it into a PyErr, where Python code can then catch it.

use pyo3::prelude::*;
use pyo3::exceptions::PyWarning;

#[pyfunction]
fn always_throws() -> PyResult<()> {
    let message = "I'm Warning, and I was raised from Rust.";
    Err(PyWarning::new_err(message))
}

Python code:

from my_module import always_throws

try:
   always_throws()
except Warning as e:
   print(f"Caught an exception: {e}")

Example: Catching Warning in Rust

use pyo3::prelude::*;
use pyo3::exceptions::PyWarning;
use pyo3::ffi::c_str;

Python::attach(|py| {
    let result: PyResult<()> = py.run(c_str!("raise Warning"), None, None);

    let error_type = match result {
        Ok(_) => "Not an error",
        Err(error) if error.is_instance_of::<PyWarning>(py) => "Warning",
        Err(_) => "Some other error",
    };

    assert_eq!(error_type, "Warning");
});

Implementations

impl PyWarning

pub fn new_err<A>(args: A) -> PyErr

where A: PyErrArguments + Send + Sync + 'static,

Creates a new PyErr of this type.

Trait Implementations

impl PyTypeInfo for PyWarning

const NAME: &'static str = "PyWarning"

Class name.

const MODULE: Option<&'static str>

Module name, if any.

fn type_object_raw(py: Python<'_>) -> *mut PyTypeObject

Returns the PyTypeObject instance for this type.

const PYTHON_TYPE: &'static str = "typing.Any"

Available on crate feature experimental-inspect only.

Provides the full python type paths.

fn type_object(py: Python<'_>) -> Bound<'_, PyType>

Returns the safe abstraction over the type object.

fn is_type_of(object: &Bound<'_, PyAny>) -> bool

Checks if object is an instance of this type or a subclass of this type.

fn is_exact_type_of(object: &Bound<'_, PyAny>) -> bool

Checks if object is an instance of this type.

impl DerefToPyAny for PyWarning

impl PyLayout<PyWarning> for PyBaseExceptionObject

impl PySizedLayout<PyWarning> for PyBaseExceptionObject

impl ToPyErr for PyWarning