Two-Dimensional Expression Layout
Lawrence D’Oliveiro
lawrencedo99 at gmail.com
Sat Aug 20 18:16:30 EDT 2016
On Sunday, August 21, 2016 at 12:48:46 AM UTC+12, Michael Selik wrote:
>
> On Fri, Aug 19, 2016 at 5:01 AM Lawrence D’Oliveiro wrote:
>
>> It is handy to be able to keep complex expressions together sometimes,
>> when breaking them up would simply obscure their structure.
>
> p0 = (0, 0)
> p1 = (major_dim, 0)
> colour_stops = (0, rect_1_colour), (1, complement(rect_1_colour))
> rect_1_pattern = qah.Pattern.create_linear(p0, p1, colour_stops)
That’s an example of what I mean about obscure structure.
>> From <https://github.com/ldo/python_pixman/blob/master/pixman.py>, a
>> complex condition (with redundant parentheses again):
>>
>> if (
>> not isinstance(src, Image)
>> or
>> mask != None and not isinstance(mask, Image)
>> or
>> not isinstance(dest, Image)
>> ) :
>> raise TypeError("image args must be Image objects")
>> #end if
>>
>
> No need for the separate calls to isinstance, nor the check for None.
>
> if any(not isinstance(obj, Image) for obj in [src, mask, dest]):
> ...
Spot the bug in your version...
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