New submission from Ivan Levkivskyi <levkivs...@gmail.com>: PEP 530 is not very clear about `await` in generator expressions. But when I try it, the error is a bit confusing:
>>> async def g(i): ... print(i) ... >>> async def f(): ... result = list(await g(i) for i in range(3)) ... print(result) ... >>> f().send(None) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 2, in f TypeError: 'async_generator' object is not iterable At the same time a (seemingly) equivalent list comprehension works fine: >>> async def f(): ... result = [await g(i) for i in range(3)] ... print(result) ... >>> f().send(None) 0 1 2 [None, None, None] Traceback (most recent call last): File "<stdin>", line 1, in <module> StopIteration I would say that the first case should either behave as a second one, or raise a syntax error. Or is it actually an intended behavior? ---------- components: Interpreter Core messages: 306732 nosy: levkivskyi, yselivanov priority: normal severity: normal status: open title: Strange behavior with await in a generator expression type: behavior versions: Python 3.6, Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32113> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
