a break for comprehensions

[Steven D. Majewski]

>>> [ x for x in iter( iter([1,2,3,4,5,6,7,8,9]).next, 6 ) ] 
[1, 2, 3, 4, 5]



>>> print iter.__doc__
iter(collection) -> iterator
iter(callable, sentinel) -> iterator

Get an iterator from an object.  In the first form, the argument must
supply its own iterator, or be a sequence.
In the second form, the callable is called until it returns the sentinel.
>>>


 iter(list).next gives you a callable object that sequentially 
    returns each value -- which gets fed to the 2 arg variant
    of iter that takes a callable and a sentinel. When it hits
    the sentinal value, it stops. 


-- Steve Majewski