On 2010-08-19, at 5:25 PM, Emile van Sebille wrote: > On 8/19/2010 7:51 AM Pete said... >> Hi, >> >> I've been reading up on list comprehensions lately, all userful and powerful >> stuff - trying to wrap my brain around it :) >> >> As the examples all seem to relate to lists, I was wondering if there is an >> elegant similar way to apply a function to all keys in a dictionary? >> >> (without looping over it, of course) > > Just fyi, as it sounds you may not understand. List Comprehensions loop over > the list. There's no other magic going on that avoids that. > > result = [ ii for ii in lst if cond ] > > is just shorthand for > > result = [] > for ii in lst: > if cond: > result.append(ii) > > Emile
Ah, so list comprehensions are a purely syntactic construct? I had the feeling there might be a performance benefit of some kind. thanks for all the contributions on this topic, it's been greatly helpful to my understanding. -Pete _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
