Licensing

[DS]

I'm pretty sure this is the wrong place to ask, but I'm hoping someone 
will point me in the right direction.

I'm getting ready to publish a first open-source project written in 
python.  I am planning to use GPLas the license.  However, in my code, 
there is a function that I like from Python Cookbook.  I would like to 
use it, although I could certainly write a less elegant version that 
would do the same thing.

So, my options appear to be:
1.   Don't use it.
2.   Use it with no comment -- that doesn't seem right.
3.   Use it with remarks in the code that acknowledge the source.
4.   Provide a separate licensing page for that function
       along with the GPL for my code.

What is the appropriate course of action here?  I'm thinking #3 is 
probably ok.  How do others deal with this in an honorable way?  In the 
book, it appears that they are saying they don't really care unless 
there is some massive use.

Thanks