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...aiter(): if i % 2: result.append(i) With the proposed asynchronous comprehensions syntax, the above code becomes as short as: result = [i async for i in aiter() if i % 2] The PEP also makes it possible to use the await expressions in all kinds of comprehensions: result = [await fun() for fun in funcs] Specification Asynchronous Comprehensions We propose to allow using async for inside list, set and dict comprehensions. Pending PEP 525 approval, we can also allow creation of ...
...AIter: def __init__(self): self.i = 0 def __aiter__(self): return self async def __anext__(self): i = self.i if i >= N: raise StopAsyncIteration self.i += 1 return i Design Considerations aiter() and anext() builtins Originally, PEP 492 defined __aiter__ as a method that should return an awaitable object, resulting in an asynchronous iterator. However, in CPython 3.5.2, __aiter__ was redefined to return asynchronou...
...aiter: async for response_item in aiter: yield response_item Arguably in regular code one can get away with skipping the with block around for loops, depending on how confident one is that one understands the internal implementation of the generator. But here we have to cope with arbitrary response handlers, so without __aiterclose__, this with construction is a mandatory part of every middleware. __aiterclose__ allows us to eliminate the mandatory boilerplate and an extra l...
...aiter__ protocol was updated. Before 3.5.2, __aiter__ was expected to return an awaitable resolving to an asynchronous iterator. Starting with 3.5.2, __aiter__ should return asynchronous iterators directly. If the old protocol is used in 3.5.2, Python will raise a PendingDeprecationWarning. In CPython 3.6, the old __aiter__ protocol will still be supported with a DeprecationWarning being raised. In CPython 3.7, the old __aiter__ protocol will no longer be supported: a RuntimeError will be raise...