I wonder if it is appropriate to replace the None sentinel with one that is an
instance
of Block() e.g.
size = total - P.BASE
excessblk = Block(size, srccol, carry_button_suppress=True, empty_block=(size
<= 0) )
In this particular case, Richard, I don't think so. The Block class is
an application-level wrapper for a graphical object. I don't want to
worry about zero-size objects. ("Is this column really empty, or does it
contain one or more zero-size blocks?") If you're interested, take a
look at "BlockHead" at www.jjposner.net.
BTW, from the (admittedly few) responses to my original post, it seems
there's some sentiment that "conditional expressions" are a non-Pythonic
misfeature. Interesting ...
-John
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