رشتهٔ گفتگو class User:

class User: user_list=[] def __init__(self, name) : self.name=name User.user_list.append(name) def register(self): x=input('What is ur name? ') if x is user_list: print ('its correct' ) else: return 'not correct' s=User('siyamak' ) print(s.register())