Dennis Sweeney <[email protected]> added the comment:
If I understand correctly, changing the -1 to a -2 does not actually make the
program "crash" -- you just only see one black circle.
The reason is that range(40, 0, -2) produces 40, 38, 36, etc., all of which are
even numbers, so rad % 2 is always 0, so col[rad % 2] is always "black". You
could try:
for index, rad in enumerate(range(40, 0, -2)):
dot(5*rad, col[index % 2])
In the future, I would suggest asking questions like this on StackOverflow,
since this is not a bug in Python itself.
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nosy: +Dennis Sweeney
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<https://bugs.python.org/issue43289>
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