On Saturday, September 26, 2015 at 10:55:57 AM UTC-7, Jori Mäntysalo wrote:
>
> On Sat, 26 Sep 2015, Travis Scrimshaw wrote:
>
> > I would use:
> >
> > if n not in ZZ:
> > raise ValueError(...)
>
> Seems easy. But to make sure: does this work in all cases? I.e. raw Python
> ints, Sage Integers, maybe something else too? At least QQ(3) in NN seems
> to work.
>
> How about positive integers? "n-1 in NN" gives bad error message if n is
> for example string. "n in NN and n>0"?
>
try:
NN(n)
except ValueError:
handle the error....
or since you want to rule out n=0:
try:
NN(n-1)
except (ValueError, TypeError):
handle the error...
--
John
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