def f1():
with yielding(2) as y:
for c in chars:
y.spawn(f(c))
yield from y
def gen_func():
with yielding(3) as y:
for c in 'abcdefghijklmn':
y.spawn(g(c))
yield from y
def gen_func():
with yielding() as y:
for c in chars:
y.spawn(f(c))
yield from y
def gen_func():
with yielding() as y:
y.spawn(asyncio.sleep(0.01))
yield from y