Tested on Python 3.3.
This software is under GPL v3 licenses! This software is a porting for cflow2dot whitch is written in perl language.
Use cflow and dot to draw call graph. output format is .svg
Thank you for Ioannis Filippidis's advice.
This software is no longer maintaining!
Please use [Ioannis Filippidis's fork] (https://github.com/johnyf/pycflow2dot) .
Ioannis Filippidis do great work on this program.