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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def register_annotype_converter(cls, types, is_array=False, is_mapping=False):
 # type: (Union[Sequence[type], type], bool, bool) -> Any """Register this class as a converter for Anno instances"""

        if not isinstance(types, Sequence):
            types = [types]

        def decorator(subclass):
            for typ in types:
                cls._annotype_lookup[(typ, is_array, is_mapping)] = subclass
            return subclass

        return decorator