Equivalent code to the bool() built-in function

[Duncan Booth]

Albert van der Horst <albert at spenarnc.xs4all.nl> wrote:

>>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.
> 
> There is. <> applied to booleans is xor.
> 
Best to get into the habit of using '!=' otherwise you'll find Python 3.x a 
bit frustrating.

However, that only works if you have exactly two values: both 'and' and 
'or' will extend easily to any number of values:

 >>> True and False and True
 False
 >>> False or False or True or False
 True

but using != for 'xor' doesn't extend the same way:

 >>> False != False != True
 False

You can use 'sum(...)==1' for a larger number of values but do have to be 
careful that all of them are bools (or 0|1).

-- 
Duncan Booth http://kupuguy.blogspot.com