On Thu, Dec 31, 2009 at 12:18 PM, Stephen Hansen <apt.shan...@gmail.com> wrote: > Hmm? Just use a sentinel which /can't/ exist in the list: then its truly > safe. If the list can contain all the usual sort of sentinels (False, None, > 0, -1, whatever), then just make a unique one all your own. > sentinel = object() > if next(g(), sentinel) is sentinel: > ... > Its impossible to get a false-positive then, as nothing g() can ever produce > would ever be precisely "sentinel" (which would usually for me be some > global const if I need to do such things in multiple places). > --S
That's not a bad idea. Another nice feature is support for callable "default" values; it would make several new things easier, including raising an exception when you really want that (i.e. if not finding a single element is truly exceptional). -- Tom -- http://mail.python.org/mailman/listinfo/python-list
