Feature suggestion: sum() ought to use a compensated summationalgorithm

[Terry Reedy]

"Szabolcs Horvát" <szhorvat at gmail.com> wrote in message 
news:fvmdg1$1e4p$1 at toralf.uib.no...
| Gabriel Genellina wrote:
| >
| > Python doesn't require __add__ to be associative, so this should not be 
used as a general sum replacement.
|
| It does not _require_ this, but using an __add__ that is not commutative
| and associative, or has side effects, would qualify as a serious misuse,

seq + seq is not commutative ;-)