Created
June 27, 2023 21:16
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| class QueueLLEmptyError(Exception): | |
| pass | |
| class Node: | |
| def __init__(self, data): | |
| self.data = data | |
| self.next = None | |
| class QueueLL: | |
| def __init__(self): | |
| self.front = None | |
| self.rear = None | |
| @property | |
| def empty(self): | |
| return self.front is None | |
| def enqueue(self, item): | |
| node = Node(item) | |
| if self.empty: | |
| self.front = node | |
| else: | |
| self.rear.next = node | |
| self.rear = node | |
| def dequeue(self): | |
| if self.empty: | |
| raise QueueLLEmptyError() | |
| item = self.front.data | |
| self.front = self.front.next | |
| if self.front is None: | |
| self.rear = None | |
| return item | |
| def peek(self): | |
| if self.empty: | |
| raise QueueLLEmptyError() | |
| return self.front.data | |
| def size(self): | |
| count = 0 | |
| current = self.front | |
| while current: | |
| count += 1 | |
| current = current.next | |
| return count | |
| q = QueueLL() | |
| q.enqueue(10) | |
| q.enqueue(20) | |
| q.enqueue(30) | |
| q.enqueue(40) | |
| q.enqueue(50) | |
| print(q.dequeue()) | |
| print(q.dequeue()) | |
| print(q.dequeue()) | |
| print(q.dequeue()) | |
| print(q.dequeue()) |
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