Turn off ZeroDivisionError?
lists at cheimes.de
Sun Feb 10 22:39:57 CET 2008
Grant Edwards wrote:
> I've always found that check to be really annoying. Every time
> anybody asks about floating point handling, the standard
> response is that "Python just does whatever the underlying
> platform does". Except it doesn't in cases like this. All my
> platforms do exactly what I want for division by zero: they
> generate a properly signed INF. Python chooses to override
> that (IMO correct) platform behavior with something surprising.
> Python doesn't generate exceptions for other floating point
> "events" -- why the inconsistency with divide by zero?
I'm aware result is arguable and professional users may prefer +INF for
1/0. However Python does the least surprising thing. It raises an
exception because everybody has learned at school 1/0 is not allowed.
>From the PoV of a mathematician Python does the right thing, too. 1/0 is
not defined, only the lim(1/x) for x -> 0 is +INF. From the PoV of a
numerics guy it's surprising.
Do you suggest that 1./0. results into +INF ? What should be the
result of 1/0?
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