code: def list_tags(self, pattern=None):
          
          request_url = "{}tags".format(self.create_basic_url())
  
          params = None
          if pattern:
              params = {'pattern': pattern}
  
          return_value = self._call_api(request_url, params=params)
          return return_value['tags']
docs: List all tags made on this project.
          :param pattern: filters the starting letters of the return value
          :return: