38 lines
1013 B
Python
38 lines
1013 B
Python
# test waiting within async with enter/exit functions
|
|
|
|
# uPy allows normal generators to be awaitables.
|
|
# CircuitPython does not.
|
|
# In CircuitPython you need to have an __await__ method on an awaitable like in CPython;
|
|
# and like in CPython, generators do not have __await__.
|
|
|
|
class Awaitable:
|
|
def __init__(self, x):
|
|
self.x = x
|
|
|
|
def __await__(self):
|
|
print('f start:', self.x)
|
|
yield self.x + 1
|
|
yield self.x + 2
|
|
return self.x + 3
|
|
|
|
class AContext:
|
|
async def __aenter__(self):
|
|
print('enter')
|
|
print('f returned:', await Awaitable(10))
|
|
async def __aexit__(self, exc_type, exc, tb):
|
|
print('exit', exc_type, exc)
|
|
print('f returned:', await Awaitable(20))
|
|
|
|
async def coro():
|
|
async with AContext():
|
|
print('body start')
|
|
print('body f returned:', await Awaitable(30))
|
|
print('body end')
|
|
|
|
o = coro()
|
|
try:
|
|
while True:
|
|
print('coro yielded:', o.send(None))
|
|
except StopIteration:
|
|
print('finished')
|