Autowait: Asynchronous REPL

Staring with IPython 7.0 and on Python 3.6+, IPython can automatically await code at top level, you should not need to access an event loop or runner yourself. To know more read the :ref:`autoawait` section of our docs, see :ghpull:`11265` or try the following code:

Python 3.6.0
Type 'copyright', 'credits' or 'license' for more information
IPython 7.0.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import aiohttp
   ...: result = aiohttp.get('https://api.github.com')

In [2]: response = await result
<pause for a few 100s ms>

In [3]: await response.json()
Out[3]:
{'authorizations_url': 'https://api.github.com/authorizations',
 'code_search_url': 'https://api.github.com/search/code?q={query}{&page,per_page,sort,order}',
...
}

Integration is by default with asyncio, but other libraries can be configured, like curio or trio, to improve concurrency in the REPL:

In [1]: %autoawait trio

In [2]: import trio

In [3]: async def child(i):
   ...:     print("   child %s goes to sleep"%i)
   ...:     await trio.sleep(2)
   ...:     print("   child %s wakes up"%i)

In [4]: print('parent start')
   ...: async with trio.open_nursery() as n:
   ...:     for i in range(3):
   ...:         n.spawn(child, i)
   ...: print('parent end')
parent start
   child 2 goes to sleep
   child 0 goes to sleep
   child 1 goes to sleep
   <about 2 seconds pause>
   child 2 wakes up
   child 1 wakes up
   child 0 wakes up
parent end

See :ref:`autoawait` for more information.

Asynchronous code in a Notebook interface or any other frontend using the Jupyter Protocol will need further updates of the IPykernel package.

Change to Nested Embed

The introduction of the ability to run async code had ripple effect on the ability to use nested IPython. You may need to install the trio library (version 05 at the time of this writing) to have this feature working.