Question

IPython 7.5文档状态：

更改为嵌套嵌入

运行异步代码功能的引入对IPython.embed（）API产生了一些影响。默认情况下，嵌入   除非指定了事件循环，否则将不允许您运行异步代码。

但是，在文档中似乎没有描述如何指定事件循环。

运行：

import IPython
IPython.embed()

然后

In [1]: %autoawait on

In [2]: %autoawait
IPython autoawait is `on`, and set to use `<function _pseudo_sync_runner at 0x00000000066DEF28>`

In [3]: import asyncio

In [4]: await asyncio.sleep(1)

礼物：

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
~\Envs\[redacted]\lib\site-packages\IPython\core\async_helpers.py in _pseudo_sync_runner(coro)
     71         # TODO: do not raise but return an execution result with the right info.
     72         raise RuntimeError(
---> 73             "{coro_name!r} needs a real async loop".format(coro_name=coro.__name__)
     74         )
     75

RuntimeError: 'run_cell_async' needs a real async loop

另一方面，运行：

import IPython
IPython.embed(using='asyncio')

然后：

In [1]: %autoawait on

In [2]: %autoawait
IPython autoawait is `on`, and set to use `asyncio`

In [3]: import asyncio

In [4]: await asyncio.sleep(1)

礼物：

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
~\Envs\[redacted]\lib\site-packages\IPython\core\async_helpers.py in __call__(self, coro)
     25         import asyncio
     26
---> 27         return asyncio.get_event_loop().run_until_complete(coro)
     28
     29     def __str__(self):

c:\python35-64\Lib\asyncio\base_events.py in run_until_complete(self, future)
    452         future.add_done_callback(_run_until_complete_cb)
    453         try:
--> 454             self.run_forever()
    455         except:
    456             if new_task and future.done() and not future.cancelled():

c:\python35-64\Lib\asyncio\base_events.py in run_forever(self)
    406         self._check_closed()
    407         if self.is_running():
--> 408             raise RuntimeError('This event loop is already running')
    409         if events._get_running_loop() is not None:
    410             raise RuntimeError(

RuntimeError: This event loop is already running
```

Answer 1

from IPython import embed
import nest_asyncio
nest_asyncio.apply()

那么 embed(using='asyncio') 可能有点用。我不知道他们为什么不给我们一个真正的解决方案。

以异步代码调用IPython.embed（）（指定事件循环）

1 个答案: