In Python 2.6, I used matplotlib to make some simple graphs. However, it is incompatible with Python 3.1.
What are some alternative modules that can accomplish the same thing without being very complex?
As an alternative to installing subversion to grab the source, Numpy's SF files page has the latest copy of 1.5 in a few different (Windows-friendly) formats:
http://sourceforge.net/projects/numpy/files/NumPy/1.5.0b1/
MathGL (GPL plotting library) have Python interface which work with Python 3 too.