isinstance(False, int)

Terry Reedy tjreedy at udel.edu
Fri Mar 5 16:27:56 EST 2010

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On 3/5/2010 1:30 PM, MRAB wrote:
> mk wrote:
>> >>> isinstance(False, int)
>> True
>> >>>
>> >>> isinstance(True, int)
>> True
>>>> Huh?
>>>> >>>
>> >>> issubclass(bool, int)
>> True
>>>> Huh?!
>>> Python didn't have Booleans originally, 0 and 1 were used instead. When
> bool was introduced it was made a subclass of int so that existing code
> wouldn't break.

And because it is useful to make it so.
Terry Jan Reedy

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