def mydecor(func):
    def wrapper():
        print('before')
        func()
        print('after')
    return wrapper()

@mydecor
def main():
    print('salam')

main()

class person:
    def __init__(self , name , family , age):
        self.name = name
        self.family = family
        self.age = age
    def showfullname(self):
        return f'name = {self.name} ' \
               f'family = {self.family}' \
               f'age = {self.age}'
    def __repr__(self):
        return f'name = {self.name} '\
               f'family = {self.family}'\
               f'age = {self.age}'

class user(person):
    pass

me=person('matin' , 'kalamipour' , 19)
you = user('matin' , 'kalamipour' , 19)

class user:
    def __init__(self, name , age):
        self.name = name
        if age>0:
            self._age=age
        else:
            self._age=0


    def get_age(self):
        return self._age

    def set_age(self , valueAge):
        if valueAge>=0:
            self._age=valueAge