Ok, I figured it out:

__radd__ function is only called if the left operand does not support
the corresponding operation and the operands are of different types.
For instance, to evaluate the expression x - y, where y is an instance
of a class that has an __radd__() method, y.__radd__(x) is called if
x.__add__(y) returns NotImplemented.


2011/3/16 Alexandre Conrad <alexandre.con...@gmail.com>
>
> Hi Chris,
>
> I checked-in a bunch of coverage for webob.acceptparse yesterday while I was 
> on flying back to SFO after PyCon, thanks to DVCS. There's still a little 
> more to do, but I can't figure out is how to test an __radd__ special method? 
> Any ideas how I can do that? (without calling it directly).
>
> It was nice to meet y'all and hacking together in the Pyramid room.
>
> Best,
> --
> Alex | twitter.com/alexconrad



--
Alex | twitter.com/alexconrad

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