leedcode-用栈实现队列

自己写的：

class MyQueue:

    def __init__(self):
        self.li=list()


    def push(self, x: int) -> None:
        self.li.append(x)


    def pop(self) -> int:
        return self.li.pop(0)


    def peek(self) -> int:

        return self.li[0]


    def empty(self) -> bool:
        return len(self.li)==0