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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 clear_display_label(self):
 """Clears the display label. raise: NoAccess - ``display_label`` cannot be modified *compliance: mandatory -- This method must be implemented.* """

        if (self.get_display_label_metadata().is_read_only() or
                self.get_display_label_metadata().is_required()):
            raise errors.NoAccess()
        self._my_map['displayLabel'] = self._display_label_metadata['default_string_values'][0]