How to add file to RSSItem of PyRSS2Gen?

I use PyRSS2Gen in my GAE application.开发者_高级运维 How can I add attached file to the RSSItem?

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Ok, here is the way to add it:

     PyRSS2Gen.RSSItem(
       enclosure = PyRSS2Gen.Enclosure(
                                        "http://www.example.com/url",
                                        17176948, # file size
                                        "mime-type"))