Python 简单的方法爬取b站dnf视频封面

 import urllib.request
 cnt=0
 def instr(keystr):
     st=keystr.find('(')+1
     strhtml=keystr[st:len(keystr)-1]
     return strhtml

 def picsave(strJson,number):
     global cnt
     strdic=strJson['data']['archives']
     num=len(strdic)
     for i in range(0,num,1):
         cnt=cnt+1
         strdic=strJson['data']['archives'][i]
         print(strdic['pic'])
         urllib.request.urlretrieve(strdic['pic'],'E:\图片\dnf\%s.jpg'%(cnt))

 def urlget(num):
     for i in range(1,num,1):
         url='https://api.bilibili.com/x/tag/ranking/archives?callback=jQuery172014070206081723846_1514982701564&tag_id=5033&rid=65&type=0&pn='+str(i)+'&ps=20&jsonp=jsonp&_=1514982702144'
         response=urllib.request.urlopen(url)
         html=response.read().decode('utf-8')
         html=instr(html)
         strJson=eval(html)
         picsave(strJson,i)

 urlget(6)
 print("ok")