[Python-ideas] `numbers.Natural`

[Thomas Gläßle]

Thomas Gläßle wrote on 09/26/2014 10:54 PM:
>
> David Mertz wrote on 09/26/2014 10:38 PM:
>> I think the original desired behavior is this different one-liner:
>>
>>     isNatural = lambda x: int(x)==x and x>0
>
> Not sure about the original desired behaviour. I would have guessed
> the former function as well, as it more closely resembles the
> isinstance checks with the numbers types:
>
>     >>> isinstance(1.0, (numbers.Rational, numbers.Integral))
>     False
And more importantly: you wouldn't expect isNatural(3.5) to return True.

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