empty clause of for loops

[Tim Chase]

On 2016-03-16 16:53, Peter Otten wrote:
> > item=None
> > for item in items:
> >         #do stuff
>   if item is None:
> >         #do something else
> 
> I like that better now I see it.

The only problem with that is if your iterable returns None as the
last item:

  items = ["Something here", None]
  item = None
  for item in items:
    print(repr(item))
  if item is None:
    print("Empty iterable") # wait, no it's not!

You'd have to use a sentinel like Ruud mentions further up-list:

  x = sentinal = object()
  for x in sequence:
    print(repr(x))
  if x is sentinal:
    print("Empty iterable")

-tkc