Problem solved. use 'command = Calc' to call my Calc function but ignore the argument passed to it. Create a list with the following elements - a.get(), b.get() and c.get(). Every time a scale slider is moved, Calc will retrieve the current scale values and I can do with them whatever I want...
Now to work out how to write the answer to a text box or similar....... Thanks for your help, Matt Tony -- http://mail.python.org/mailman/listinfo/python-list
