On 7/4/2018 2:32 PM, Sven R. Kunze wrote:
Sorry for adding yet another mail. :-(
On 04.07.2018 10:54, Serhiy Storchaka wrote:
Sorry, this PEP was rewritten so many times that I missed your Appendix.
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
Repeat response given elsewhere. No. Python has limited precision
floats, not reals. Floats do not obey laws of real numbers.
>>> 1e50 + 1e34 == 1e50
True
>>> 1e50 + 1e35 == 1e50
False
Basic numerical analysis operation: approximate infinite sum of
decreasing terms by summing terms until they become small enough that
they can be ignored.
--
Terry Jan Reedy
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