第一种方法

Traceback (most recent call last):

 File "c:\Users\Administrator\Desktop\text\test.urlliber.py", line 5, in <module>

   responsel=urllib2.urlopen(url)

 File "C:\python27\lib\urllib2.py", line 127, in urlopen

   return _opener.open(url, data, timeout)

 File "C:\python27\lib\urllib2.py", line 402, in open

   req = meth(req)

 File "C:\python27\lib\urllib2.py", line 1113, in do_request_

   raise URLError('no host given')

URLError: <urlopen error no host given>