On 04.07.2018 21:18, Steven D'Aprano wrote:
Read the Appendix to the PEP:
https://github.com/python/peps/blob/master/pep-0572.rst
Yes, I did after I realized where that example came from. But my point
was actually to understand the evaluation order because Uncle Timmy
won't be around to explain when new code appears.
And no, total is not always not equal to total.
Err, yeah. Double negation rules. ;-)
I read it as:
while total != updated total:
do stuff
and find it easier to follow than having to juggle the extra
book-keeping "old" variable in the original code.
updated_total rocks. Reminds me of those pattern, we usually use in
those cases.
What just confused me is the evaluation order. It seems to me that it's
like left-to-right first and then assignment expression.
Using some math-style-inspired markers (execution-irrelevant) would be cool:
while total != (total' := total + term):
do stuff
total and total' can be different at the same whereas total is total (at
least in my mental model).
But it seems I need to adapt here.
Regards,
Sven
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