Python 2.7 使用python tweepy提取时出现错误401

我正在使用Twitter API

我运行此代码时出错；它在每行打印401，如下所示：

from tweepy.streaming import StreamListener
from tweepy import OAuthHandler
from tweepy import Stream

access_token = "ENTER YOUR ACCESS TOKEN"
access_token_secret = "ENTER YOUR ACCESS TOKEN SECRET"

consumer_key = "ENTER YOUR API KEY"
consumer_secret = "ENTER YOUR API SECRET"

class StdOutListener(StreamListener):

    def on_data(self, data):
        print data
        return True

    def on_error(self, status):
        print status

if __name__ == '__main__':

    #This handles Twitter authetification and the connection to Twitter Streaming API
    l = StdOutListener()
    auth = OAuthHandler(consumer_key, consumer_secret)
    auth.set_access_token(access_token, access_token_secret)
    stream = Stream(auth, l)

    #This line filter Twitter Streams to capture data by the keywords:
    stream.filter(track=['python'])

我已经输入了由Twitter帮助生成的访问令牌和消费者密钥。 我做错了什么