Method setattro

crates/vm/src/stdlib/_thread.rs:999–1019

(
            zelf: &Py<Self>,
            attr: &Py<PyStr>,
            value: PySetterValue,
            vm: &VirtualMachine,
        )

    impl SetAttr for Local {
        fn setattro(
            zelf: &Py<Self>,
            attr: &Py<PyStr>,
            value: PySetterValue,
            vm: &VirtualMachine,
        ) -> PyResult<()> {
            if attr.as_bytes() == b"__dict__" {
                Err(vm.new_attribute_error(format!(
                    "{} attribute '__dict__' is read-only",
                    zelf.class().name()
                )))
            } else {
                let dict = zelf.l_dict(vm);
                if let PySetterValue::Assign(value) = value {
                    dict.set_item(attr, value, vm)?;
                } else {
                    dict.del_item(attr, vm)?;
                }
                Ok(())
            }
        }
    }

    // Registry of all ThreadHandles for fork cleanup