Python decorator

decorator.py

# Python decorator is a convenient way to wrap functions with reused logic

def Dec(F):
    def G(*args):
        print('wrapper starts')
        F(*args)
        print('wrapper ends')
    return G

@Dec
def F(*args):
    print('F executes')

F('hi')

# output #
#>> wrapper starts
#>> F executes
#>> wrapper ends


# Class decoratr #

class D:
    def __init__(self, F) -> None:
        self.f = F
    def __call__(self, *args, **kwargs):
        print('wrapper class starts')
        self.f(*args, **kwargs)
        print('wrapper class ends')

@D
def F(*args, **kwargs):
    print('F executes')

F()