How to use the bugwarrior.util.rate_limit function in bugwarrior

    @rate_limit(limit_amount=50, limit_period=60)
    def _reqs(self, tag):
        """ Grab all the pull requests """
        return [(tag, i) for i in self.ghc.pull_requests.list(tag)]

def _rate_limit(*args, **kw):
            if time.time() - rate_limit.start > self.limit_period:
                rate_limit.start, rate_limit.counter = time.time(), 0

            rate_limit.counter += 1

            if rate_limit.counter == self.limit_amount - 1:
                duration = self.limit_period - \
                        (time.time() - rate_limit.start) + 1
                log.warning("Expected to exceed API rate limit. Sleeping {0}s",
                        duration)
                time.sleep(duration)

            return func(*args, **kw)

    @rate_limit(limit_amount=50, limit_period=60)
    def _add_comments(self, tag, issue):
        """ Return an issue with comments added """

        if issue.comments == 0:
            return tag, issue, {}

        comments = self.ghc.issues.comments(tag, issue.number)

        result = {}
        for c in comments:
            d = time.mktime(c.updated_at.timetuple())
            result['annotation_%i' % int(d)] = "%s: %s" % (
                c.user[:6], c.body[:29]
            )

        return tag, issue, result

    @rate_limit(limit_amount=50, limit_period=60)
    def _issues(self, tag):
        """ Grab all the issues """
        return [(tag, i) for i in self.ghc.issues.list(tag)]

def __init__(self, limit_amount, limit_period):
        self.limit_amount = limit_amount
        self.limit_period = limit_period
        rate_limit.start = time.time()
        rate_limit.counter = 0