Ejemplo obtener 40 primeros resultados de una busqueda en youtube de un texto "la guerra del opio"

ytb.py

from pyquery import PyQuery as pq
from urllib import urlencode

for page in range(2):
    params = urlencode({'filters':'video', 'page':page, 'search_query': 'la guerra del opio'})
    jq = pq(url="http://www.youtube.com/results?%s" % params,
            headers={"user-agent": "Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20140129 Firefox/24.0"})
    jq.make_links_absolute("http://www.youtube.com")
    for video in jq("ol.item-section").children().items():
        url = video.find("a.yt-uix-tile-link").attr("href")
        title = video.find("a.yt-uix-tile-link").text()
        time = video.find("span.video-time").text()   
        if time:
            tsecs = 0
            items = time.split(':')
            items.reverse()
            for i in range(len(items)):
                tsecs += int(items[i])*(60**i)          
        description = video.find("div.yt-lockup-description").text()
        thumb = video.find("div.yt-thumb img").attr("data-thumb")
        if not thumb:
            thumb = video.find("div.yt-thumb img").attr("src")
        if thumb:
            thumb = thumb.lstrip("//")     
        meta = video.find("ul.yt-lockup-meta-info").text()

        print
        print "url:", url
        print "title:", title
        print "time:", time
        print "time in seconds", tsecs
        print "description:", description
        print "thumbnail:", thumb
        print "meta:", meta