human
I wrote the below code

    minrate = None
    if ((rate is not None) and (rate_limit is not None)):
        minrate = (float(rate_limit) / float(rate))
    def wrapper(f):
        last = [0.0]
        def ratelimited(*args, **kwargs):
            if (minrate is not None):
                elapsed = (time.clock() - last[0])
                left = (minrate - elapsed)
                if (left > 0):
                    time.sleep(left)
                last[0] = time.clock()
            ret = f(*args, **kwargs)
            return ret
        return ratelimited
    return wrapper

What's a good function header?
assistant
#Here's a good function header.

def rate_limit(rate=None, rate_limit=None):