Randy Lea has written an RPN (Reverse Polish Notation) calculator in
PythonCard. I've checked it into cvs

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/pythoncard/PythonCardPrototyp
e/samples/rpn/

I'll let Randy tell you more about it if he likes and answer any questions
you might have about his sample.

Congratulations Randy!

The one thing to be aware of is that it uses the RightTextField component
based on wxRightTextCtrl, a contrib to wxPython. Apparently, this control
only displays correctly on Windows and even there has a few display
glitches. There has been some talk on wx-dev and wx-users about supporting
alignment in wxTextCtrl which is really the best solution, but unless that
happens, RightTextField sort of works.

If you want to give up right-alignment, the only change necessary is in
rpn.rsrc.py, replace

{'type':'RightTextField',

with

{'type':'TextField',

save and you're set. No other changes to the resource or source code are
necessary.

ka


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