human
What is a the Python code you requested given the following:
I am working on the file "01_Collecting_tweets_using_Twitter_API.ipynb".
The first task is:
Saving the stream to a file
Lets' define a new StreamListener that will save the collected data to a file
Can you write Python code for it?
assistant
#Here is the Python code you requested.

#override tweepy.StreamListener to make it save data to a file
class StreamSaver(tweepy.StreamListener):
    def __init__(self, filename, max_num_tweets=2000, api=None):
        self.filename = filename
        
        self.num_tweets = 0
        
        self.max_num_tweets = max_num_tweets
        
        tweepy.StreamListener.__init__(self, api=api)
        
        
    def on_data(self, data):
        #print json directly to file
        
        with open(self.filename,'a') as tf:
            tf.write(data)
            
        self.num_tweets += 1
        
        print(self.num_tweets)
        
        if self.num_tweets >= self.max_num_tweets:
            return True
            
    def on_error(self, status):
        print(status)

# create the new StreamListener and stream object that will save collected tweets to a file
saveStream = StreamSaver(filename='testTweets.txt')
mySaveStream = tweepy.Stream(auth = api.auth, listener=saveStream)

mySaveStream.filter(track=['realdonaldtrump,trump'], languages=['en'])

mySaveStream.disconnect()