"0 in [True,False]" returns True

[bonono at gmail.com]

Grant Edwards wrote:
> > He seems to be testing "boolean type", not whether it is true
> > or false.
>
> Right.  But that's almost always pointless.  Knowing whether a
> variable is a boolean or not is very rarely useful.  What one
> wants to know is whether a varible is true or not. The code for
> that is:
>
>   if v:
>       something
>
>   if not v:
>       something
>
He doesn't want to know whether a variable is true or not, but whether
it is a boolean value. He seems to use the same variable to store both
boolean value, as well as other data type(see another post by OP) for
distinct meaning. Whether this is a good design is another matter and
debatable. Within Python, I think it is not needed as 1/0 and
True/False are basically interchangeable no matter where it is used.