[Python-ideas] Programming recommendations (PEP 8) and boolean values

[Yuval Greenfield]

On Thu, Aug 9, 2012 at 10:15 AM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> Le 08/08/2012 16:28, Guido van Rossum a écrit :
>
>  I'd be strongly against changing that rule. If you don't want other
>> types than bool, use an isinstance check. Code using "is True" is most
>> likely a bug. (It's different for None, since that has no second value
>> that is assumed.)
>>
>
> That said, I'm also curious about the answer to Michael's following
> question:
> “why does it say that using an identity check is worse than an equality
> check?”
>
>
In python 3.2.3:

    >>> 1 == True
    True
*    >>> 13 == True*
*    False*
    >>> bool(1)
    True
    >>> bool(13)
    True
    >>> 1 is True
    False
    >>> 13 is True
    False

To my surprise identity is actually less confusing than equality. So I
agree with Antoine and Michael on that point.
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