901f3dce6e
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.
30 lines
603 B
Python
30 lines
603 B
Python
# test basic async for execution
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# example taken from PEP0492
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class AsyncIteratorWrapper:
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def __init__(self, obj):
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print('init')
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self._it = iter(obj)
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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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try:
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value = next(self._it)
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except StopIteration:
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raise StopAsyncIteration
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return value
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async def coro():
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async for letter in AsyncIteratorWrapper('abc'):
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print(letter)
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o = coro()
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try:
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o.send(None)
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except StopIteration:
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print('finished')
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