232. Implement Queue using Stacks

https://leetcode.com/problems/implement-queue-using-stacks/

Python

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

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

    def pop(self) -> int:
        keep = []

        while self.stack:
            keep.append(self.stack.pop())
        
        result = keep.pop()
        
        while keep:
            self.stack.append(keep.pop())

        return result
        

    def peek(self) -> int:
        return self.stack[0]
        

    def empty(self) -> bool:
        return not bool(self.stack)