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37e1b5c891
MicroPython's original implementation of __aiter__ was correct for an earlier (provisional) version of PEP492 (CPython 3.5), where __aiter__ was an async-def function. But that changed in the final version of PEP492 (in CPython 3.5.2) where the function was changed to a normal one. See https://www.python.org/dev/peps/pep-0492/#why-aiter-does-not-return-an-awaitable See also the note at the end of this subsection in the docs: https://docs.python.org/3.5/reference/datamodel.html#asynchronous-iterators And for completeness the BPO: https://bugs.python.org/issue27243 To be consistent with the Python spec as it stands today (and now that PEP492 is final) this commit changes MicroPython's behaviour to match CPython: __aiter__ should return an async-iterable object, but is not itself awaitable. The relevant tests are updated to match. See #6267.
48 lines
973 B
Python
48 lines
973 B
Python
# test waiting within "async for" __anext__ function
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import sys
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if sys.implementation.name == 'micropython':
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# uPy allows normal generators to be awaitables
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coroutine = lambda f: f
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else:
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import types
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coroutine = types.coroutine
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@coroutine
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def f(x):
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print('f start:', x)
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yield x + 1
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yield x + 2
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return 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 f(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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