python

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应该是你的代码有问题, 你又什么都没提 ...

>>> url = 'http://py4e-data.dr-chuck.net/comments_845667.html'
>>> html = urllib.request.urlopen(url).read()
>>>

>>> url = ''
>>> html = urllib.request.urlopen(url).read()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Software\Python\lib\urllib\request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Software\Python\lib\urllib\request.py", line 510, in open
    req = Request(fullurl, data)
  File "C:\Software\Python\lib\urllib\request.py", line 328, in __init__
    self.full_url = url
  File "C:\Software\Python\lib\urllib\request.py", line 354, in full_url
    self._parse()
  File "C:\Software\Python\lib\urllib\request.py", line 383, in _parse
    raise ValueError("unknown url type: %r" % self.full_url)
ValueError: unknown url type: ''
>>>

>>> url = 'py4e-data.dr-chuck.net/comments_845667.html'
>>> html = urllib.request.urlopen(url).read()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Software\Python\lib\urllib\request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "C:\Software\Python\lib\urllib\request.py", line 510, in open
    req = Request(fullurl, data)
  File "C:\Software\Python\lib\urllib\request.py", line 328, in __init__
    self.full_url = url
  File "C:\Software\Python\lib\urllib\request.py", line 354, in full_url
    self._parse()
  File "C:\Software\Python\lib\urllib\request.py", line 383, in _parse
    raise ValueError("unknown url type: %r" % self.full_url)
ValueError: unknown url type: 'py4e-data.dr-chuck.net/comments_845667.html'
>>>