thanks! On Sun, Jan 11, 2009 at 2:12 PM, Guilherme Polo <ggp...@gmail.com> wrote:
> On Sun, Jan 11, 2009 at 2:02 PM, Alexandre Fiori <fio...@gmail.com> wrote: > > > > hello > > > > i was thinking about a possible improvement for the itemgetter > > the documentation page shows simple examples like sorting a dictionary by > > its integer values > > Hi, > > Sorry for starting like this but ideas are supposed to be emailed to > the python-ideas maillist. > > > . > > . > > > > in order for that sort (and possibly a lot of other things) to work > > properly, we could add > > a callback method for itemgetter, like this: > > > > class itemgetter: > > def __init__(self, index, callback=None): > > self.index = index > > self.callback = callback > > > > def __call__(self, item): > > return self.callback and self.callback(item[self.index]) or > > item[self.index] > > > > so, we could easly sort by the amount of data in each list, like this: > > > >>>> sorted(friends.items(), key=itemgetter(1, callback=len)) > > [('john', ['max']), ('alex', ['bob', 'jane']), ('foo', ['bar', 'steve', > > 'linda'])] > > > > > > what do you guys think about it? please correct me if i'm wrong. > > > > > > You are not forced to use itemgetter as a key in sorted, you can > provide your own key method, like this: > > def x(item): > return len(item[1]) > > sorted(friends.items(), key=x) > > Also, your idea ruins the name "itemgetter" since it is no longer a > itemgetter. > > -- > -- Guilherme H. Polo Goncalves > -- Ship ahoy! Hast seen the While Whale? - Melville's Captain Ahab
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