On Wed, Jul 04, 2018 at 08:32:32PM +0200, Sven R. Kunze wrote:
> >>while total != (total := total + term):
> >> term *= mx2 / (i*(i+1))
> >> i += 2
> >>return total
>
> This very example here caught my eye.
>
> Isn't total not always equal to total? What would "regular" Python have
> looked like?
Read the Appendix to the PEP:
https://github.com/python/peps/blob/master/pep-0572.rst
And no, total is not always not equal to total. When total and term are
sufficiently different, total+term underflows to just total, and the
loop exits.
py> total = 1.5e30
py> term = 12.5
py> total + term != total
False
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.
YMMV.
--
Steve
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