Python3 timeout error urllib.request.urlopen

I have a script, a witch is getting data from a site. I first wrote it in 2.7 python and his works. When I rewrite it in python3 I have a problem. In python2.7 which works great

     for x in xrange(len(ll.string2)-1):
            psR = urllib2.urlopen(ll.string2[x]).read()
            nrL = Przystanek()  
            nrL.feed(psR)
            self.BusExtData += nrL.string2

      

        
        
        
      

    

python3

        for x in range(len(ll.string2)-1):
             psR = urllib.request.urlopen(ll.string2[x],timeout=3000).read().decode('iso-8859-2')
             nrL = Przystanek() 
             nrL.feed(psR)
             self.BusExtData += nrL.string2

      

        
        
        
      

    

The top code generates a timeout error.

 i = 0      
 while i<(len(ll.string2)-1):           
 try:
                psR = urllib.request.urlopen(ll.string2[i],timeout=3000).read().decode('iso-8859-2')
                nrL = Przystanek()
                nrL.feed(psR)
                self.BusExtData += nrL.string2
                i=i+1           
except:
                print("Error")
                i=i-1

                pass

      

        
        
        
      

    

I avoid this uppercase problem. But I don't know why urllib2.urlopen doesn't make a timeout error. When I use urllib.request.urlopen I get this error message:

urllib.error.URLError: urlopen time error

or

urllib.error.URLError: urlopen time error [WinError 10060]

What is the difference between urlib2.urlopen and urllib.request.urlopen?