Lawrence D’Oliveiro lawrencedo99 at gmail.com
Fri Aug 19 18:31:01 EDT 2016

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On Saturday, August 20, 2016 at 9:56:05 AM UTC+12, codew... at gmail.com wrote:
>
> On Friday, August 19, 2016 at 5:30:22 PM UTC-4, Lawrence D’Oliveiro wrote:
>
>> On Saturday, August 20, 2016 at 7:52:09 AM UTC+12, codew... at gmail.com
>> wrote:
>>>     if any([
>>>         not isinstance(src, Image),
>>>         mask != None and not isinstance(mask, Image),
>>>         not isinstance(dest, Image),
>>>     ]):
>>>         raise TypeError("image args must be Image objects")
>>> 
>>> Or equivalently:
>>> 
>>>     if not all([
>>>         isinstance(src, Image),
>>>         mask is None or isinstance(mask, Image),
>>>         isinstance(dest, Image),
>>>     ]):
>>>         raise TypeError("image args must be Image objects")
>> 
>> Using “all” or “any” in this sort of situation may not be such a good
>> idea.
> 
> Would you care to elaborate?

There is no short-cut evaluation when constructing tuples and lists.

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