follow.py 文件源码

def follow(twitter, screen_name, followers=True):
    """Get the entire list of followers/following for a user."""
    user_ids = []
    cursor = -1
    fail = Fail()
    while True:
        try:
            portion, cursor = follow_portion(twitter, screen_name, cursor,
                                             followers)
        except TwitterError as e:
            if e.e.code == 401:
                reason = ("follow%s of that user are protected"
                          % ("ers" if followers else "ing"))
                err("Fail: %i Unauthorized (%s)" % (e.e.code, reason))
                break
            elif e.e.code == 429:
                err("Fail: %i API rate limit exceeded" % e.e.code)
                rls = twitter.application.rate_limit_status()
                reset = rls.rate_limit_reset
                reset = time.asctime(time.localtime(reset))
                delay = int(rls.rate_limit_reset
                            - time.time()) + 5 # avoid race
                err("Interval limit of %i requests reached, next reset on %s: "
                    "going to sleep for %i secs" % (rls.rate_limit_limit,
                                                    reset, delay))
                fail.wait(delay)
                continue
            elif e.e.code == 502:
                err("Fail: %i Service currently unavailable, retrying..."
                    % e.e.code)
            else:
                err("Fail: %s\nRetrying..." % str(e)[:500])
            fail.wait(3)
        except urllib2.URLError as e:
            err("Fail: urllib2.URLError %s - Retrying..." % str(e))
            fail.wait(3)
        except httplib.error as e:
            err("Fail: httplib.error %s - Retrying..." % str(e))
            fail.wait(3)
        except KeyError as e:
            err("Fail: KeyError %s - Retrying..." % str(e))
            fail.wait(3)
        else:
            new = -len(user_ids)
            user_ids = list(set(user_ids + portion))
            new += len(user_ids)
            what = "follow%s" % ("ers" if followers else "ing")
            err("Browsing %s %s, new: %i" % (screen_name, what, new))
            if cursor == 0:
                break
            fail = Fail()
    return user_ids