code: def get_all_volumes(self, region=None):
          
          if region:
              url = "volumes?region={}".format(region)
          else:
              url = "volumes"
          data = self.get_data(url)
          volumes = list()
          for jsoned in data['volumes']:
              volume = Volume(**jsoned)
              volume.token = self.token
              volumes.append(volume)
          return volumes
docs: This function returns a list of Volume objects.