problem with my urllib.urlopen() function

[Xell Zhang]

hello all,
I am a newbie in Python.
In my module, if I call urllib.urlopen() function like:
url = "http://www.google.com/"
source = urllib.urlopen(url)

Then in the output there will be an exception:
Exception exceptions.AttributeError: "'NoneType' object has no attribute
'print_exc'" in <bound method FancyURLopener.__del__ of <
urllib.FancyURLopener instance at 0x00D59AA8>> ignored


I do not know why, if I did something wrong?
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