class user:

    def __init__(self,name):
        return print(f'salam esme man {name} hast.')
x=user('matin') # result => salam esme man matin hast.

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

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

main()