Thanks to all for the informative answers.
You made me realize this is a wxPython issue. I have to say, wxPython
seems useful, and I'm glad it is available - but it doesn't have the
gentlest of learning curves.
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Pretty new to Python, but I thought I understood what is meant by an
assignment is a reference.
Until I tried to understand this.
Here is a (fragment of an) event handler for a group of three wxPython
toggle buttons. The idea is to change the appearance of the label of
the button that was
