code: def vacuum(self, threshold=0.3):
          '''
          Force garbage collection
  
          :param float threshold (optional): The threshold is optional, and
          will not change the default threshold.
          :rtype: boolean
  
          '''
          url = ("http://{master_addr}:{master_port}/"
                 "vol/vacuum?garbageThreshold={threshold}").format(
              master_addr=self.master_addr,
              master_port=self.master_port,
              threshold=threshold)
          res = self.conn.get_data(url)
          if res is not None:
              return True
          return Falsf vacuum(self, threshold=0.3):
          '''
          Force garbage collection
  
          :param float threshold (optional): The threshold is optional, and
          will not change the default threshold.
          :rtype: boolean
  
          '''
          url = ("http://{master_addr}:{master_port}/"
                 "vol/vacuum?garbageThreshold={threshold}").format(
              master_addr=self.master_addr,
              master_port=self.master_port,
              threshold=threshold)
          res = self.conn.get_data(url)
          if res is not None:
              return True
          return False
docs: Force garbage collection
  
          :param float threshold (optional): The threshold is optional, and
          will not change the default threshold.
          :rtype: boolean