Re: isinstance(False, int)

[Terry Reedy]

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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