Equivalent code to the bool() built-in function

[Grant Edwards]

On Tue, Apr 19, 2011 at 7:09 AM, Christian Heimes <lists at cheimes.de> wrote:
> Am 18.04.2011 21:58, schrieb John Nagle:
>> ?? ?? This is typical for languages which backed into a "bool" type,
>> rather than having one designed in. ??The usual result is a boolean
>> type with numerical semantics, like
>>
>> ??>>> True + True
>> 2
>
> I find the behavior rather useful. It allows multi-xor tests like:
>
> if a + b + c + d != 1:
> ?? ??raise ValueError("Exactly one of a, b, c or d must be true.")

I guess I never thought about it, but there isn't an 'xor' operator to
go along with 'or' and 'and'.  Must not be something I need very often.

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