python处理网页过程中出现的问题

1、

url = "www.main.org"

>>> raw = urlopen(url).read()

Traceback (most recent call last):

File "<pyshell#8>", line 1, in <module>

raw = urlopen(url).read()

File "/usr/lib/python2.7/urllib.py", line 86, in urlopen

return opener.open(url)

File "/usr/lib/python2.7/urllib.py", line 207, in open

return getattr(self, name)(url)

File "/usr/lib/python2.7/urllib.py", line 462, in open_file

return self.open_local_file(url)

File "/usr/lib/python2.7/urllib.py", line 476, in open_local_file

raise IOError(e.errno, e.strerror, e.filename)

IOError: [Errno 2] No such file or directory: 'www.main.org'

解决方法：

url = http://www.main.org/

>>> raw = urlopen(url).read()