operator module functions

Ethan Furman ethan at stoneleaf.us
Thu Oct 9 01:35:11 CEST 2014


On 10/08/2014 03:46 PM, Terry Reedy wrote:
> On 10/8/2014 5:49 PM, Ethan Furman wrote:
>> [redirecting back to the list]
>
>>>>> I'm not sure what situation you would have to type them (as opposed to
>>>>> simply a + b) that the operator module would help with.
>>>>
>>>> unittest springs to mind:
>>>>
>>>>     self.assertRaises(TypeError, op.add, obj1, obj2)
>>>
>>> Er, my point is, that is not a situation where you would be able to use
>>> obj1.__add__ - you'd have to use the operator module *anyway*, and
>>> therefore aren't using it just to get the convenience of a non-dunder
>>> name.
>>
>>   self.assertRaises(TypeError, lambda x, y: x+y, obj1, obj2)
>
> That works, but is a bit harder to type (given the import), more confusing to read (the extra ',' that does *not*
> delimit an argument) and adds an extra layer to the call stack with each call.  The extra layer *could* make a
> difference in recursion.

Indeed, thanks for the corrections.  I was merely replying to the "have to use the operator module anyway" comment.

--
~Ethan~



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