Rate limiting function calls with Python Decorators [Py3]

rateLimitDecorator.py

import time


def rate_limit(max_per_second=2):
    min_interval = 1.0 / float(max_per_second)

    def decorate(func):
        last_time_called = [0.0]

        def rate_limited_func(*args, **kargs):
            elapsed = time.process_time() - last_time_called[0]
            left_to_wait = min_interval - elapsed
            if left_to_wait > 0:
                time.sleep(left_to_wait)
            ret = func(*args, **kargs)
            last_time_called[0] = time.process_time()
            return ret

        return rate_limited_func

    return decorate


@rate_limit(2)  # 2 per second at most
def PrintNumber(num):
    print(num)


if __name__ == "__main__":
    print("This should print 1,2,3... at about 2 per second.")
    for i in range(1, 100):
        PrintNumber(i)