剑指offer python版 用两个栈实现队列

class myqueue(object):
    def __init__(self):
        self.stack=[]
        self.stack2=[]
        
    def push(self,values):
        for i in values:
            self.stack.append(i)
            
    def pop(self):
        while self.stack:
            self.stack2.append(self.stack.pop())
        ret=[]            
        while self.stack2:
            ret.append(self.stack2.pop())   
            
        return ret
    
        del ret
        
a=myqueue()
a.push([1,2,3,4,4])

print(a.pop())