Method try_from_object

crates/stdlib/src/pystruct.rs:28–44

(vm: &VirtualMachine, obj: PyObjectRef)

    impl TryFromObject for IntoStructFormatBytes {
        fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
            // CPython turns str to bytes but we do reversed way here
            // The only performance difference is this transition cost
            let fmt = match_class!(match obj {
                s @ PyStr => s.isascii().then_some(s),
                b @ PyBytes => ascii::AsciiStr::from_ascii(&b)
                    .ok()
                    .map(|s| vm.ctx.new_str(s)),
                other =>
                    return Err(vm.new_type_error(format!(
                        "Struct() argument 1 must be a str or bytes object, not {}",
                        other.class().name()
                    ))),
            })
            .ok_or_else(|| vm.new_unicode_decode_error("Struct format must be a ascii string"))?;
            Ok(Self(fmt))
        }
    }

    impl IntoStructFormatBytes {