pyo3 0.28.3

Bindings to Python interpreter
Documentation 
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use crate::{sync::PyOnceLock, types::PyType, Bound, Py, Python};

pub struct ImportedExceptionTypeObject {
    imported_value: PyOnceLock<Py<PyType>>,
    module: &'static str,
    name: &'static str,
}

impl ImportedExceptionTypeObject {
    pub const fn new(module: &'static str, name: &'static str) -> Self {
        Self {
            imported_value: PyOnceLock::new(),
            module,
            name,
        }
    }

    pub fn get<'py>(&self, py: Python<'py>) -> &Bound<'py, PyType> {
        self.imported_value
            .import(py, self.module, self.name)
            .unwrap_or_else(|e| {
                panic!(
                    "failed to import exception {}.{}: {}",
                    self.module, self.name, e
                )
            })
    }
}