Operator commutativity

Steven D'Aprano steve+comp.lang.python at pearwood.info
Tue Sep 20 04:43:25 CEST 2011


On Mon, 19 Sep 2011 22:26:30 -0400, Roy Smith wrote:

> In article <4e77eae1$0$29978$c3e8da3$5496439d at news.astraweb.com>,
>  Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> 
>> Westley Martínez wrote:
>> 
>> > def __radd__(self, other):
>> >     return self.__add__(self, other)
>> 
>> Which, inside a class, can be simplified to:
>> 
>>     __radd__ = __add__
> 
> Ooh, I could see that leading to some weird diagnostics.

"Weird"?

You've lived a sheltered life if you think a function being known under 
two names is weird. Wait until you discover monkey-patching built-ins for 
fun and profit!



-- 
Steven



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