urllib2 python ne peut pas fonctionner sur certains site

Question

import urllib2 

    def download(url,user_agent = 'wswp',num_retries=2): 
     print 'downloading:',url 
     headers = {'User-Agent': 'Mozilla/5.0'} 
     request = urllib2.Request(url,headers=headers) 
     try: 
      html = urllib2.urlopen(request).read() 
     except urllib2.URLError as e: 
      print "download error:" 
      html = None 
      if num_retries>0: 
       if hasattr(e,'code') and 500<=e.code<600: 
        print "e.code = ",e.code 
        return download(url,num_retries-1) 
     return html 
    print download("http://www.huaru.cc/mobile/product/xsim.html") 

le résultat: C: \ Python27 \ python.exe E:/py2_7/untitled1/téléchargement secondClass_Agent: http://www.huaru.cc/mobile/product/xsim.html

Processus terminé avec le code de sortie 0

Answer 1

En Python, l'indentation est la clé.

import urllib2 


def download(url,user_agent = 'wswp',num_retries=2): 
    print('downloading:', url) 
    headers = {'User-Agent': 'Mozilla/5.0'} 
    request = urllib2.Request(url, headers=headers) 
    try: 
     html = urllib2.urlopen(request).read() 
    except urllib2.URLError as e: 
     print("download error: {}".format(e)) 
     html = None 
     if num_retries > 0: 
      if hasattr(e, 'code') and 500 <= e.code < 600: 
       print("e.code = ", e.code) 
       return download(url, num_retries-1) 
    return html 

print download("http://www.huaru.cc/mobile/product/xsim.html") 

Et il montre comme ce qui suit:

('downloading:', 'http://www.huaru.cc/mobile/product/xsim.html') 
download error: HTTP Error 404: Not Found 
None 

Ceci est parce que la page Web est de retour 404.

Il est testé sur Python 2.7.10 et 3.6

Vérifier pep8: https://www.python.org/dev/peps/pep-0008/#id17