duct example for https://github.com/oconnor663/duct.rs/issues/99

main.rs

const PYTHON_PROGRAM: &str = r#"
import sys

print("something for stdout")
print("something for stderr", file=sys.stderr)
"#;

fn main() {
    let logf = std::fs::File::create("logfile.txt").unwrap();
    duct::cmd!("python", "-c", PYTHON_PROGRAM)
        .stderr_to_stdout()
        .unchecked()
        .stdout_file(logf)
        .run()
        .unwrap();
}