On 10/15/2017 9:12 PM, Jason Campbell wrote:
...  
> itertools.cycle could use membership from the underlying iterable

If the underlying iterable is an iterator, this does not work.  You
could define a Cycle class that requires that the input have .__contain__.

> itertools.repeat is even easier, just compare to the repeatable element

Again, create a Repeat(ob) class whose .__iter__ returns repeat(ob) and
that has .__contains__(x) returning 'x == ob'.

> Does anyone else think this would be useful?

itertools is not going to switch from iterators to non-iterator iterables.