text: ########################################################################## Section 13.13.2 snippets
  # Authenticating
  import tweepy
  
  import keys
  
  auth = tweepy.OAuthHandler(keys.consumer_key, 
                             keys.consumer_secret)               
  
  auth.set_access_token(keys.access_token, 
                        keys.access_token_secret)
                   
  api = tweepy.API(auth, wait_on_rate_limit=True, 
                   wait_on_rate_limit_notify=True)               
  
  # Creating a TweetListener 
  from tweetlistener import TweetListener
  
  tweet_listener = TweetListener(api)
  
  # Creating a Stream 
  tweet_stream = tweepy.Stream(auth=api.auth, 
                               listener=tweet_listener)
                   
  # Starting the TweetListeneret Stream
  tweet_stream.filter(track=['Mars Rover'], is_async=True) 
  
  # Asynchronous vs. Synchronous Streams
  
  # Other filter Method Parameters
  
  # Twitter Restrictions Note
  
  ##########################################################################
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  # development, research, and testing of the theories and programs        #
  # to determine their effectiveness. The authors and publisher make       #
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