class zhan: def __init__(self): self.s=['1','2'] def top(self): if self.s: return self.s[-1] return False def yazhan(self,name): self.s.extend(name) return True def tanzhan(self): if self.s: res=self.s.pop() return res return False def changdu(self): return len(self.s) def chakan(self): return self.s def seek(self,name): if name not in self.s: return False return self.s.index(name) A=zhan() # print(A.changdu(),A.yazhan('3'),A.yazhan('3'),A.tanzhan(),\ # A.chakan()) print(A.seek(''))