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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 get_display_names_metadata(self):
 """Gets the metadata for all display_names. return: (osid.Metadata) - metadata for the display_names *compliance: mandatory -- This method must be implemented.* """

        metadata = dict(self._display_names_metadata)
        metadata.update({'existing_string_values': [t['text'] for t in self.my_osid_object_form._my_map['displayNames']]})
        return Metadata(**metadata)