Problems managing Python source with CVS

[Kevin Smith]

I have been developing some fairly large Python packages lately and I would 
like to use CVS to manage them.  I am new to CVS and I'm having trouble 
putting the two together effectively.  The major obstacle is how to test a 
modified file that is part of a package without having to checkout the entire 
package.  For example,

mypackage/__init__.py
                 mod1.py    # imports stuff from mod2
                 mod2.py

After checking out mod2.py and making my modifications, I'm not sure how to 
get mod1.py to import my modified version of mod2.py to test the changes 
rather than importing the objects from mod2.py in the unmodified tree.

Kevin Smith
Kevin.Smith at sas.com