<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def getlist(self, key, type_=None):
 # type: (Hashable, Callable) -> List[Any] """ Return the list of items for a given key. If that key is not in the `MultiDict`, the return value will be an empty list. Just as `get` `getlist` accepts a `type` parameter. All items will be converted with the callable defined there. :param key: The key to be looked up. :param type_: A callable that is used to cast the value in the :class:`MultiDict`. If a :exc:`ValueError` is raised by this callable the value will be removed from the list. :return: a :class:`list` of all the values for the key. """

        try:
            rv = dict.__getitem__(self, key)
        except KeyError:
            return []
        if type_ is None:
            return list(rv)
        result = []
        for item in rv:
            try:
                result.append(type_(item))
            except ValueError:
                pass
        return result