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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_service_type(cls, subclass):
 """Registers subclass handlers of various service-type-specific service implementations. Look for classes decorated with @Folder._register_service_type for hints on how this works."""

        if hasattr(subclass, '__service_type__'):
            cls._service_type_mapping[subclass.__service_type__] = subclass
            if subclass.__service_type__:
                setattr(subclass,
                        subclass.__service_type__,
                        property(lambda x: x))
        return subclass