| 1 | class Queue: |
| 2 | def __init__(self): |
| 3 | self.items = [] |
| 4 | |
| 5 | def isEmpty(self): |
| 6 | return self.items == [] |
| 7 | |
| 8 | def enqueue(self, item): |
| 9 | self.items.insert(0, item) |
| 10 | |
| 11 | def dequeue(self): |
| 12 | return self.items.pop() |
| 13 | |
| 14 | def size(self): |
| 15 | return len(self.items) |
| 16 | |
| 17 | q = Queue() |
| 18 | q.enqueue(4) |