Printing Traceback

[baris-inandi]

When using RustPython for embedded scripting purposes, I want to be able to print out the traceback if the input fails.

Currently I am using this function:

use rustpython::vm;

pub fn run_py(code: &str, filename: &str) {
    match vm::Interpreter::with_init(Default::default(), |vm| {
        vm.add_frozen(rustpython_pylib::frozen_stdlib())
    })
    .enter(|vm| {
        let scope = vm.new_scope_with_builtins();

        let code_obj = vm
            .compile(code, vm::compiler::Mode::Exec, String::from(filename))
            .map_err(|err| vm.new_syntax_error(&err))?;

        return vm.run_code_obj(code_obj, scope);
    }) {
        Ok(_) => {}
        Err(e) => {
            println!("{:?}", e.traceback().unwrap()); // !!!HERE!!!
        }
    };
}

to call an arbitrary Python string within Rust.

Example usage:

run_py("print('hi')", "main.py");

How can I print the traceback when the program fails? There is no apparent way to turn a traceback to a rust string.

[baris-inandi]

Figured it out! I iterated over e.args().to_vec() and called .str().unwrap().to_string() on all of them to see all the traceback messages.