Use async def instead of def ... -> Awaitable in typing#7105
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srittau merged 2 commits intopython:masterfrom Feb 2, 2022
sobolevn:patch-128
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Use async def instead of def ... -> Awaitable in typing#7105srittau merged 2 commits intopython:masterfrom sobolevn:patch-128
async def instead of def ... -> Awaitable in typing#7105srittau merged 2 commits intopython:masterfrom
sobolevn:patch-128
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Diff from mypy_primer, showing the effect of this PR on open source code: tornado (https://github.com/tornadoweb/tornado)
+ tornado/gen.py:429: error: Incompatible return value type (got "WaitIterator", expected "AsyncIterator[Any]")
+ tornado/gen.py:429: note: Following member(s) of "WaitIterator" have conflicts:
+ tornado/gen.py:429: note: Expected:
+ tornado/gen.py:429: note: def __anext__(self) -> Coroutine[Any, Any, Any]
+ tornado/gen.py:429: note: Got:
+ tornado/gen.py:429: note: def __anext__(self) -> Future[Any]
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srittau
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Feb 2, 2022
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Source: https://github.com/python/cpython/blob/187930f74c44e460ba09c60ba5d9bb4fac543d8f/Lib/_collections_abc.py#L206-L240
Why is that important? Because
async defis aCoroutine, which is much more thanAwaitable. For example, this backfires in #6779