On Tue, 12 Jul 2005 23:07:07 -0500, Terry Hancock <[EMAIL PROTECTED]> wrote:
>On Monday 11 July 2005 08:53 pm, Bengt Richter wrote: >> On Tue, 12 Jul 2005 10:12:33 +1000, John Machin <[EMAIL PROTECTED]> wrote: >> >Bengt Richter wrote: >> >> for x in (x for x in seq if x is not None): >> >Byzantine ... >> Perhaps not if you wanted to enumerate the selected elements, as in >> for i, x in enumerate(x for x in seq if x is not None): > >Seems like a bug waiting to happen -- wouldn't someone using that >idiom most likely have *meant* something like this: > >for i,x in enumerate(seq): > if x is not None: > print "seq[%d] = %s is not None" % (i, repr(x)) > >? > >But of course that's not equivalent. It's hard to imagine a >use case for an enumerated loop when the object being >iterated over is anonymous (will be lost as soon as the loop >exits). > Line numbers in a listing of non-None things? Page breaks at the right places? Filtering out '' instead of NOne from results of a string split before creating numbered html names for links to non-blank text elements in rendering text as html? I dunno, seems like at least a few possibilities for something halfway sensible... Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list