48 lines
1.1 KiB
Python
48 lines
1.1 KiB
Python
# test waiting within "async for" __anext__ function
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# uPy allows normal generators to be awaitables.
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# CircuitPython does not.
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# In CircuitPython you need to have an __await__ method on an awaitable like in CPython;
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# and like in CPython, generators do not have __await__.
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class Awaitable:
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def __init__(self, x):
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self.x = x
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def __await__(self):
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print('f start:', self.x)
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yield self.x + 1
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yield self.x + 2
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return self.x + 3
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class ARange:
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def __init__(self, high):
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print('init')
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self.cur = 0
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self.high = high
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def __aiter__(self):
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print('aiter')
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return self
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async def __anext__(self):
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print('anext')
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print('f returned:', await Awaitable(20))
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if self.cur < self.high:
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val = self.cur
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self.cur += 1
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return val
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else:
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raise StopAsyncIteration
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async def coro():
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async for x in ARange(4):
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print('x', x)
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o = coro()
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try:
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while True:
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print('coro yielded:', o.send(None))
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except StopIteration:
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print('finished')
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