graphical or flow charting design aid for python class development?

[William Gill]

Being somewhat new to Python, and having a tendency to over complicate 
things in my class design, I was wondering if anyone can suggest a 
simple graphical or flowcharting tool that they use to organize their 
class and program  design?  Because of a 55 mph head-on accident a few 
years back, I have short term memory problems, so flipping back and 
forth between pages of code is next to impossible for me to keep 
straight.  A simple graphical model  would allow me to 'see' everything 
in one view, and better organize my resulting code. I have had limited 
success using pydoc to view my classes, but it's not really much help in 
development, just review, and sometimes there is too much info.

I have used editors for other languages that allow the view to expand 
and collapse functions/methods (like message threads here on the board), 
which help, but I haven't seen anything like this for python.

Thanks for any suggestions.

Bill