How to test if a variable has a natural number?

[Alexander Schmolck]

pythonguy at Hotpop.com (Anand Pillai) writes:

> How about this...
> 
> from types import *
> 
> def natural(num):
>     if num>0 and type(num) is IntType:
>         return 1
>     else:
>         return 0

Nope. 

>>> natural(1L)
0


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