On Mon, Nov 14, 2016 at 7:02 AM, Antoon Pardon <antoon.par...@rece.vub.ac.be> wrote: > Some time ago I read a text or saw a video on iterators and one thing > I remember from it, is that you should do something like the following > when working with iterators, to avoid some pitt falls. > > def bar(iterator): > if iter(iterator) is iterator: > ... > > However I can't relocate it and can't remember the what and how anymore. > Does anyone know what this is about?
That's how you distinguish an iterator from other iterables. An iterable is something you can call iter() on; an iterator is required to specifically return _itself_. What you do with that information, though, depends on the function. In a lot of cases, you shouldn't care - if you need an iterator, just "iterator = iter(iterator)" at the top and move on. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
