CODE EXAMPLE FOR PYTHON

class decorator python

# class decorators act in the same way as a function decorator
# but a class can maintain and update a state

class CountCalls:
    def __init__(self, func):       #class decorator __init__ takes func
        self.func = func
        self.num_calls = 0          #keep tract of how many times func got executed
    
    def __call__(self, *args, **kwargs):
        self.num_calls += 1
        print(f'This is executed {self.num_calls} times')
        return self.func(*args, **kwargs)
    
@CountCalls
def say_hello():
    print('Hello')
    
say_hello()
# This is executed 1 times
# Hello
say_hello()
# This is executed 2 times
# Hello