Function printer

flow-python/examples/basis_function/future/op.py:15–22

()

@source_def()
def printer():
    (fut1, waker1) = create_future()
    yield waker1
    (fut2, waker2) = create_future()
    yield waker2

    [r1, r2] = join([lambda: fut1.wait(), lambda: fut2.wait()])
    print('printer: ', r1, r2)