当我在循环数组队列中出列时，我的项目不能正确显示

class CircularQueue:
    def __init__(self, capacity):
        self.capacity = capacity
        self.queue = [None] * capacity
        self.front = 0
        self.rear = -1
        self.size = 0

    def enqueue(self, item):
        if self.is_full():
            raise IndexError("Queue is full")
        self.rear = (self.rear + 1) % self.capacity
        self.queue[self.rear] = item
        self.size += 1

    def dequeue(self):
        if self.is_empty():
            raise IndexError("Queue is empty")
        item = self.queue[self.front]
        self.front = (self.front + 1) % self.capacity
        self.size -= 1
        return item

    def is_empty(self):
        return self.size == 0

    def is_full(self):
        return self.size == self.capacity

# 示例使用
cq = CircularQueue(5)
cq.enqueue(1)
cq.enqueue(2)
cq.enqueue(3)
print(cq.dequeue())  # 输出 1
print(cq.dequeue())  # 输出 2