Python AssertionError：来自非盈利组织的收益率'；不用于将来

此代码：

import asyncio
async def wee():
    address = 'localhost'
    port = 5432
    reader, writer = asyncio.open_connection(address, port)
    message = '/t'
    print('Send: %r' % message)
    writer.write(message.encode())

async def main():
    t2 = asyncio.ensure_future(wee())
    await t2

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())

…生成一个错误断言error:yield from未与future一起使用 通过此回溯：

Traceback (most recent call last):
  File "ssh_as.py", line 20, in <module>
    loop.run_until_complete(main())
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/base_events.py", line 337, in run_until_complete
    return future.result()
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py", line 274, in result
    raise self._exception
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py", line 241, in _step
    result = coro.throw(exc)
  File "ssh_as.py", line 16, in main
    await t2
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py", line 358, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py", line 290, in _wakeup
    future.result()
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py", line 274, in result
    raise self._exception
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py", line 239, in _step
    result = coro.send(None)
  File "ssh_as.py", line 9, in wee
    reader, writer = asyncio.open_connection(address, port)
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/streams.py", line 64, in open_connection
    lambda: protocol, host, port, **kwds)
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/base_events.py", line 599, in create_connection
    yield from tasks.wait(fs, loop=self)
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py", line 341, in wait
    return (yield from _wait(fs, timeout, return_when, loop))
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py", line 424, in _wait
    yield from waiter
  File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py", line 359, in __iter__
    assert self.done(), "yield from wasn't used with future"
AssertionError: yield from wasn't used with future

回溯（最近一次呼叫最后一次）：
文件“ssh_as.py”，第20行，在
循环。运行\u直到完成（main（））
文件“/usr/local/cillar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/base_events.py”，第337行，运行_直到完成
返回future.result（）
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py”，第274行，结果
提出自己的意见
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py”，第241行，步骤
结果=核心投掷（exc）
文件“ssh_as.py”，第16行，在main中
等待t2
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py”，第358行，在__
屈服自我——这告诉任务等待完成。
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py”，第290行，在“唤醒”中
future.result（）
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py”，第274行，结果
提出自己的意见
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py”，第239行，分步执行
结果=coro.send（无）
文件“ssh_as.py”，第9行，wee格式
读写器=asyncio.open\u连接（地址、端口）
文件“/usr/local/cillar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/streams.py”，第64行，开放式连接
lambda：协议、主机、端口，**kwds）
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/base_events.py”，第599行，位于create_connection中
从任务中获得收益。等待（fs，loop=self）
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py”，第341行，正在等待
返回（从_wait（fs、超时、返回_when、循环）得到的收益）
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/tasks.py”，第424行，在等待中
侍者的让步
文件“/usr/local/ceral/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/futures.py”，第359行，在__
assert self.done（），“未将从中获得的收益用于future”
AssertionError:future没有使用收益率

---

如果我只使用一个变量，而不是将asyncio.open\u连接解包到reader、writer和just to

dummy=asyncio.open\u连接（…

没有这样的错误，尽管

虚拟对象不能作为文档的
StreamReader
使用-
类型错误：'generator'对象不可订阅
。完全不知道会发生什么，请帮助。
您需要更改
异步。打开\U连接（地址、端口）
line to
wait asyncio.open\u connection（地址、端口）
。open connection返回一个future/promise等，您需要“wait”该结果才能访问其内容