Antoon Pardon wrote: > On 2005-12-10, Duncan Booth <[EMAIL PROTECTED]> wrote: [snip] > >> I also think that other functions could benefit. For instance suppose > >> you want to iterate over every second element in a list. Sure you > >> can use an extended slice or use some kind of while. But why not > >> extend enumerate to include an optional slice parameter, so you could > >> do it as follows: > >> > >> for el in enumerate(lst,::2) > > > > 'Why not'? Because it makes for a more complicated interface for something > > you can already do quite easily. > > Do you think so? This IMO should provide (0,lst[0]), (2,lst[2]), > (4,lst[4]) ... > > I haven't found a way to do this easily. Except for something like: > > start = 0: > while start < len(lst): > yield start, lst[start] > start += 2 > > But if you accept this, then there was no need for enumerate in the > first place. So eager to learn something new, how do you do this > quite easily?
>>> lst = ['ham','eggs','bacon','spam','foo','bar','baz'] >>> list(enumerate(lst))[::2] [(0, 'ham'), (2, 'bacon'), (4, 'foo'), (6, 'baz')] No changes to the language necessary. -- http://mail.python.org/mailman/listinfo/python-list
