I would use:
if n not in ZZ:
raise ValueError(...)
Best,
Travis
On Saturday, September 26, 2015 at 12:35:05 PM UTC-5, Jori Mäntysalo wrote:
>
> An example:
>
> sage: g = Graph({0:[1,2]})
> sage: list(g.breadth_first_search(0, distance='junk'))
> [0, 1, 2]
>
> This can be corrected: try: n = Integer(...) ... if n<0: raise...
>
> But it seems stupid to mechanically copy this code. So should we add
> something like _check_integer_all(), _check_integer_nonnegative() and
> _check_integer_positive() to Sage? This way hopefully we would get more
> checking for errors and have unified exception strings?
>
> --
> Jori Mäntysalo
>
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