(self, op: Operation)
| 31 | if operation is not None: self._container.append(operation) |
| 32 | |
| 33 | def append(self, op: Operation): |
| 34 | self._container.append(op) |
| 35 | return self |
| 36 | |
| 37 | def append_left(self, op: Operation): |
| 38 | self._container.appendleft(op) |
no outgoing calls