Adding class variables to defined class

Question

I'm a little confused on this particular problem and I have had this trouble for quite sometime now. The problem is that I don't know how to properly add a new class variable to an already defined class. In my scenario, I am using the tweepy module and using its Streaming API in order to get twitter messages that contain 'lol' in them.

Here is the code so far:

import tweepy

class StreamListener(tweepy.StreamListener):
    #I want to add some code here in order to open a file

    def on_status(self, status):
        try:
            #Rather than printing here I would like to write to the file
            print status.text
        except:
            self.textOut.close()

    auth1 = tweepy.auth.OAuthHandler(XXXXX, XXXX)
    auth1.set_access_token(XXXXX, XXXXX)
    api = tweepy.API(auth1)

    textOut = open('twitterMessages.txt')
    l = StreamListener()
    streamer = tweepy.Stream(auth=auth1, listener=l, timeout=3000000000 )
    setTerms = ['lol', 'Lol', 'LOL']
    streamer.filter(None,setTerms)

Look at the comments I made. I want to open a file to begin with and write to the file. The problem is when I create an init method, it seems to override the original init method.

phihag · Accepted Answer · 2012-07-29 21:59:15Z

4

Use super to call the original __init__, and wrap the file I/O in a with statement:

auth1 = tweepy.auth.OAuthHandler('CONSUMER KEY','CONSUMER SECRET')
auth1.set_access_token('ACCESS TOKEN','ACCESS TOKEN SECRET')
api = tweepy.API(auth1)

class StreamListener(tweepy.StreamListener):
    def __init__(self, f):
        super(StreamListener, self).__init__()
        self._f = f
    def on_status(self, status):
        printf(status)
        self._f.write(status.text)

with open('twitterMessages.txt', 'w') as outf:
    l = StreamListener(outf)
    streamer = tweepy.Stream(auth=auth1, listener=l, timeout=3000000000 )
    setTerms = ['lol', 'Lol', 'LOL']
    streamer.filter(None,setTerms)

answered Jul 29, 2012 at 21:59

phihag

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BrenBarn · Accepted Answer · 2012-07-29 21:46:18Z

3

You can write your own __init__ and still call the base class __init__:

class SubClass(BaseClass):
    def __init__(self):
        BaseClass.__init__(self)
        # do whatever you want here

If your customized __init__ you can open a file and do, e.g., self.outFile = open("somefile.txt", "w"), then in your on_status method do self.outFile.write(status.text), and so on.

answered Jul 29, 2012 at 21:46

BrenBarn

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