deletes an element from the rear end of the deque
(self)
| 117 | self.queue.append(data) |
| 118 | |
| 119 | def delete_rear(self): |
| 120 | """ |
| 121 | deletes an element from the rear end of the deque |
| 122 | """ |
| 123 | if self.is_empty(): |
| 124 | return -1 |
| 125 | else: |
| 126 | return self.queue.pop(0) |
| 127 | |
| 128 | def delete_front(self): |
| 129 | """ |