Please read http://www.python.org/dev/patches/
The best format for a patch is a "diff -u" format. It's much much easier
to see what you changed to the existing code, and the same patch often
applies to several versions.
Also, 2.4 and 2.5 are closed for new developments - your changes would
only go to a 2.7 version.

And your change is more likely to be accepted if it contains unit tests
(in Lib/test/test_wave.py)