circuitpython/tests/basics/async_await.py

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# test basic await expression
# adapted from PEP0492
async def abinary(n):
print(n)
if n <= 0:
return 1
l = await abinary(n - 1)
r = await abinary(n - 1)
return l + 1 + r
o = abinary(4)
try:
while True:
o.send(None)
except StopIteration:
print('finished')