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