that's a slice of the iterator. With a single ``stop`` argument,
it will return the first ``stop``
elements. If you supply a starting index, you'll get ``stop-start``
-elements, and if you supply a value for ``step`, elements will be
+elements, and if you supply a value for ``step`, elements will be
skipped accordingly. Unlike Python's string and list slicing, you
can't use negative values for ``start``, ``stop``, or ``step``.