[Tutor] Returns an iterator of tuples

[Steven D'Aprano]

On Wed, Nov 27, 2013 at 02:15:22AM -0800, Mike Sila wrote:
> I know what return, iteration and tuples are.  Can anyone please tell 
> me what an iterator of tuples is?


An iterator is a thing which returns objects one at a time instead of 
all at once. The easiest way to get one is to pass a sequence object 
like a list, string or tuple to the function iter(). An example:


py> it = iter("Hello!")
py> next(it)
'H'
py> next(it)
'e'
py> next(it)
'l'
py> next(it)
'l'
py> next(it)
'o'
py> next(it)
'!'
py> next(it)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration


So an iterator of tuples is an iterator which returns tuples. Here's a 
simple example:


py> it = iter([ (1,2), (3,4), (5,6) ])
py> next(it)
(1, 2)
py> next(it)
(3, 4)
py> next(it)
(5, 6)



-- 
Steven