[Python-Dev] Is X a (sequence|mapping)?
Tim Peters
tim.one@home.com
2001年1月23日 17:02:41 -0500
>> operator.isMappingType()
>> + some other C style _Check() APIs
[Guido]
> Yes, these should probably be deprecated. I certainly have never
> used them! (The operator module doesn't seem to get much use in
> general...
It's used heavily by test_operator.py <wink>. Outside of that, it's used
maybe three times in the std distribution, nowhere essential; the
return map(operator.__div__, rgbtuple, _maxtuple)
in Pynche's ColorDB.py is typical. 2.0's
return [x / 256. for x in rgbtuple]
does the same thing more clearly (_maxtuple is a module constant).
It appeals to functional-language fans and extreme micro-optimizers, so they
don't have to type "lambda" in the simplest cases. At least
operator.truth(x) is *clearer* than "not not x".
> Was it a bad idea?)
Mixed, but I'd say more bad than good overall.