Method setdefault

crates/vm/src/builtins/dict.rs:341–349

(
        &self,
        key: PyObjectRef,
        default: OptionalArg<PyObjectRef>,
        vm: &VirtualMachine,
    )

    #[pymethod]
    fn setdefault(
        &self,
        key: PyObjectRef,
        default: OptionalArg<PyObjectRef>,
        vm: &VirtualMachine,
    ) -> PyResult {
        self.entries
            .setdefault(vm, &*key, || default.unwrap_or_none(vm))
    }

    #[pymethod]
    pub fn copy(&self) -> Self {