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pyo3 0.12.1

Bindings to Python interpreter
Documentation 
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//! Useful tips for writing tests:
//!  - Tests are run in parallel; There's still a race condition in test_owned with some other test
//!  - You need to use flush=True to get any output from print

#[macro_export]
macro_rules! py_assert {
    ($py:expr, $val:ident, $assertion:expr) => {
        pyo3::py_run!($py, $val, concat!("assert ", $assertion))
    };
}

#[macro_export]
macro_rules! py_expect_exception {
    ($py:expr, $val:ident, $code:expr, $err:ident) => {{
        use pyo3::types::IntoPyDict;
        let d = [(stringify!($val), &$val)].into_py_dict($py);

        let res = $py.run($code, None, Some(d));
        let err = res.unwrap_err();
        if !err.matches($py, $py.get_type::<pyo3::exceptions::$err>()) {
            panic!("Expected {} but got {:?}", stringify!($err), err)
        }
    }};
}