while expression feature proposal

[Paul Rubin]

Ian Kelly <ian.g.kelly at gmail.com> writes:
> j = int(random() * n)
> while j in selected:
>     j = int(random() * n)

from itertools import dropwhile

j = dropwhile(lambda j: j in selected,
                 iter(lambda: int(random() * n), object()))
             .next()

kind of ugly, makes me wish for a few more itertools primitives, but I
think it expresses reasonably directly what you are trying to do.