Can I get original value of PyErr?

[bachue]

I just define a pyclass struct to store a rust error;

#[pyclass]
pub struct IoError(std::io::Error);

and pass its instance into PyIOError::new_err(IoError(...))

How can I get the original std::io::Error from the PyIOError or PyErr?
I tried to call PyErr::value(), but still cannot extract IoError from it.
Thanks

[birkenfeld]

Your IoError is not an exception. The value is a standard Python IOError, but you can get at the "contents" with (in Python) err.args[0].

[bachue]

@birkenfeld Thanks for your reply, but can I get the value of err.args[0] in Rust?

[birkenfeld]

You start with err, which is the PyErr::value(). Then you can call err.getattr("args")?.get_item(0)?.

[bachue]

@birkenfeld It works! Thank you!