On Tue, Feb 10, 2009 at 1:57 PM, Steven D'Aprano <ste...@remove.this.cybersource.com.au> wrote: > On Tue, 10 Feb 2009 12:50:02 -0800, Josh Dukes wrote: > >> The thing I don't understand is why a generator that has no iterable >> values is different from an empty list. > > How do you know it has no iterable values until you call next() on it and > get StopIteration? > > By the way, your "has_values" function is just a slower version of the > built-in any().
<nitpick> Not quite: if the generator produces one or more elements but those elements happen to be boolean false according to Python, then any() will be false but has_values() will be true. The functions serve different purposes (produces at least 1 value vs. has at least one true value). Cheers, Chris -- Follow the path of the Iguana... http://rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
