python - 栈与队列(只有代码)

class Stack(object):
    def __init__(self):
        self.stack = []

    def peek(self):
        return self.stack[len(self.stack)-1]

    def empty(self):
        return self.stack == []

    def push(self, values):
        self.stack.append(values)
        return values
    
    def pop(self):
        try:
            return self.stack.pop()
        except IndexError as q:
            return None

class Queue(object):
    def __init__(self, max_len):
        self.len = max_len  # 记录队列的最大存储量
        self.index = -1  # 记录队列的索引
        self.q = []  # 存储队列的数据

    def push(self, values):
        if len(self.q) == self.len:
            print(‘len_q : ‘,len(self.q))
            print(‘len : ‘,self.len)
            raise IndexError("Queue is full")
        else:
            self.index += 1
            return self.q.append(values)

    def pop(self):
        if self.index == -1:
            raise IndexError("Queue is empty")
        self.index -= 1
        return self.q.pop(0)

q = Queue(2)
for i in range(3):
    q.push(i)

print(q.pop())
print(q.pop())