Method try_from_object

crates/stdlib/src/select.rs:129–139

(vm: &VirtualMachine, obj: PyObjectRef)

impl TryFromObject for Selectable {
    fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
        let fno = obj.try_to_value(vm).or_else(|_| {
            let meth = vm.get_method_or_type_error(
                obj.clone(),
                vm.ctx.interned_str("fileno").unwrap(),
                || "select arg must be an int or object with a fileno() method".to_owned(),
            )?;
            meth.call((), vm)?.try_into_value(vm)
        })?;
        Ok(Self { obj, fno })
    }
}

// Keep it in a MaybeUninit, since on windows FD_ZERO doesn't actually zero the whole thing