Function get_dict_opt_u64

crates/stdlib/src/lzma.rs:222–234

(
        spec: &PyObjectRef,
        key: &str,
        vm: &VirtualMachine,
    )

    }

    fn get_dict_opt_u64(
        spec: &PyObjectRef,
        key: &str,
        vm: &VirtualMachine,
    ) -> PyResult<Option<u64>> {
        let dict = spec.downcast_ref::<PyDict>().ok_or_else(|| {
            vm.new_type_error("Filter specifier must be a dict or dict-like object")
        })?;
        match dict.get_item_opt(key, vm)? {
            Some(obj) => Ok(Some(obj.try_into_value::<u64>(vm)?)),
            None => Ok(None),
        }
    }

    fn parse_filter_spec_lzma(spec: &PyObjectRef, vm: &VirtualMachine) -> PyResult<LzmaOptions> {
        let preset = get_dict_opt_u32(spec, "preset", vm)?.unwrap_or(PRESET_DEFAULT);