Example of iteration over YouTube comments with Python.

gistfile1.py

import gdata.youtube.service
yts = gdata.youtube.service.YouTubeService()
urlpattern = "http://gdata.youtube.com/feeds/api/videos/" + \
             "9ar0TF7J5f0/comments?start-index=%d&max-results=25"
index = 1
url = urlpattern % index
comments = []
while True: 
    ytfeed = yts.GetYouTubeVideoCommentFeed(uri=url)
    comments.extend([comment.content.text for comment in ytfeed.entry])
    if not ytfeed.GetNextLink(): break
    url = ytfeed.GetNextLink().href