decorators.py

import functools

class CountCalls:
    def __init__(self, x):
        self.x = x

    def __call__(self, func):
        functools.update_wrapper(self, func)
        self.func = func
        self.num_calls = 0
        print(f"X == {self.x}")
        def wrapper(*args, **kwargs):
            self.func(*args, **kwargs)
        self.num_calls += 1
        print(f"Call {self.num_calls} of {self.func.__name__!r}")
        return wrapper


@CountCalls(123)
def say_whee():
    print(f"Whee!")

say_whee()