problem with interface of operator.itemgetter

dou dou nirvana117 at gmail.com
Tue Aug 18 18:49:55 CEST 2009


2009/8/17 Simon Forman <sajmikins at gmail.com>

>  You can use a little helper function to create your itemgetter like this:
>
> def makeItemGetter(indexes):
>    I = itemgetter(*indexes)
>    if len(indexes) > 1:
>        return I
>    return lambda thing: (I(thing),)
>
> If indexes contains only one index the itemgetter is wrapped in a
> lambda that turns its output into a tuple.


Thanks. I just thought if the stdlib could support some function like item*s
*getter would be better, it always returns tuple instead of a item or a
tuple of items.
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