运行时错误：在python3.8中，等待未与future 异步词典理解一起使用

gather()返回一个Future对象(this is，错误消息显示为-await wasn't used with future的Future对象).

如果您需要对象的结果(以便对其进行迭代)，则需要首先将其设置为await:

async def main():
    lost = [4, 8, 15, 16, 23, 42]
    awaitables = asyncio.gather(*[div7_tuple(x) for x in lost])
    print({k: v for k, v in await awaitables})

或者:

async def main():
    lost = [4, 8, 15, 16, 23, 42]
    awaitables = await asyncio.gather(*[div7_tuple(x) for x in lost])
    print(dict(awaitables))

源代码中的相关代码为here:

    def __await__(self):
        if not self.done():
            self._asyncio_future_blocking = True
            yield self
        if not self.done():
            raise RuntimeError("await wasn't used with future")
        return self.result()  # May raise too.

    __iter__ = __await__  # make compatible with 'yield from'.

That __iter__ = __await__ is what makes it possible to iterate over a Future(and not to get a TypeError instead which says "TypeErr或者: 'Future' object is not iterable") but since you didn't use await to make that Future done(It's result get set) it shows you that error message.