function to write the contents of a webpage into a new file

[snippsat]

What version of python are you using?  urllib2 was a 2.x thing, and was renamed in 3.x.

That's not the problem here.
If use urllib2 in Python 3.x,
then this error would have been thrown before the error he gets.

>>> import urllib2
Traceback (most recent call last):
 File "<string>", line 301, in runcode
 File "<interactive input>", line 1, in <module>
ImportError: No module named 'urllib2'