decorator_example.py

def logging_time(func):
    def logger(*args, **kwargs):
        start = time.time()
        returned = func(*args, **kwargs)
        end = time.time()
        print(f"Calling {func.__name__} time: {end - start:.5f}")
        return returned

    return logger


@logging_time
def calculate_sum(n):
    return sum(range(n+1))