import time

class counter_of_calls(object):
	def __init__(self, f):
		self._f = f
		self._cnt = 0

	def __call__(self, *args, **kwargs):
		self._cnt += 1
		result = self._f(*args, **kwargs)
		print(self._f.__name__, "has been called", self._cnt, "times; last time:", time.time())
		return result


@counter_of_calls
def f(x):
	return x + 6

@counter_of_calls
def g(x):
	return x + 7

if( __name__ == "__main__"):
	print(f(3))
	print(f(5))

	print(g(3))
	print(g(5))