为什么当我试图获取给定关键字的YouTube视频时，我的Python代码会返回错误

Question

每当我尝试运行代码时，我都会收到以下错误："comment_content error！'nonetype'对象没有属性'href'"我是Python的新手，自己没有写这段代码；它是给我用的。我的理解是，它以前运行正常？这可能与YouTube数据API自编写以来的变化有关吗？

import pdb
import gdata.youtube
import gdata.youtube.service
import codecs
import time
client = gdata.youtube.service.YouTubeService()
query = gdata.youtube.service.YouTubeVideoQuery()

### the input words are here
query.vq = "4b hair"
#######
# the out put file are here
viewFile = codecs.open('views4b_hair.csv', 'w')
commentFile=codecs.open('comments4b_hair.csv', 'w')
##########

query.max_results = 50
query.start_index = 0
query.safesearch = "moderate"
#query.format = 5
query.orderby = "relevance"
#query.author = "hawaiinani"
#pdb.set_trace() 


for i in range(19):
    #pdb.set_trace() 
    query.start_index=str(int(query.start_index)+50)
    feed = client.YouTubeQuery(query)
    print len(feed.entry)
    youtubeid=[]
    youtubetitle=[]
    for entry in feed.entry:
        #youtubetitle.append(entry.title.text)
        youtubeid.append(entry.id.text[38:])
        print entry.id.text[38:],i
        try:
           entry_comment = client.GetYouTubeVideoEntry(video_id=entry.id.text[38:])
           comment_feed = client.GetYouTubeVideoCommentFeed(video_id=entry.id.text[38:])            
           viewFile.write(','.join([entry.id.text[38:],entry_comment.published.text,
                               str(entry_comment.media.duration.seconds), str(entry_comment.statistics.view_count),comment_feed.total_results.text,entry_comment.media.title.text.decode('ascii', errors='ignore').encode('ascii', 'ignore')]) + 'n')
            #videop.append("%s, %s,%s, %s, %s, %s" % (search_result["id"]["videoId"],entry.published.text,
            #                       entry.media.duration.seconds, entry.statistics.view_count,comment_feed.total_results.text,entry.media.title.text))
            #  
           #time.sleep(3)
        except Exception, ex:
            print 'View_content Error', ex
            time.sleep(10)
        try:
           comment_content = client.GetYouTubeVideoCommentFeed(video_id=entry.id.text[38:])
           indexh=0
           #while comment_content:
           while indexh<10:
               indexh=indexh+1
               for comment_entry in comment_content.entry:
                   pubText = comment_entry.published.text
                   #print pubText
                   titleText = comment_entry.content.text.decode('ascii', errors='ignore').encode('ascii', 'ignore')
                   #print titleText
                   #print 'Got title'
                   #pubText, titleText = comment_entry.published.text, comment_entry.title.text
                   commentFile.write(','.join([entry.id.text[38:],pubText,titleText]) + 'n'+'n')
                   #commentFile.write(u',')
                   #commentFile.write(pubText + u',')
                   #print 'About to write title'
                   #print titleText
                   #print 'Wrote title'
                   #commentlist.append("%s, %s,%s" % (search_result["id"]["videoId"],pubText, titleText)) 
               comment_content=client.Query(comment_content.GetNextLink().href)
               #time.sleep(3)
           #time.sleep(3)
        except Exception, ex:
            print 'Comment_content Error!', ex
            time.sleep(5)


    #pdb.set_trace()
viewFile.close()
commentFile.close()

Answer 1

当comment_content.GetNextLink()变为None时发生错误。为了修复它，请替换：

while indexh < 10:

带有：

while indexh < 10 and comment_content:

也可替换：

comment_content=client.Query(comment_content.GetNextLink().href)

带有：

next_link = comment_content.GetNextLink()
if next_link:
    comment_content = client.Query(next_link.href)
else:
    comment_content = None

希望能有所帮助。