code: def close(self):
          '''Forcibly close all connections.
  
          This instance will not be usable after calling this method.
          '''
          for connection in self.ready:
              connection.close()
  
          for connection in self.busy:
              connection.close()
  
          self._closed = Truf close(self):
          '''Forcibly close all connections.
  
          This instance will not be usable after calling this method.
          '''
          for connection in self.ready:
              connection.close()
  
          for connection in self.busy:
              connection.close()
  
          self._closed = True
docs: Forcibly close all connections.
  
          This instance will not be usable after calling this method.