docs/source/whatsnew/pr/await-repl.rst

Await REPL
----------

:ghpull:`10390` introduced the ability to ``await`` Futures and
Coroutines in the REPL. For example::

    Python 3.6.0
    Type 'copyright', 'credits' or 'license' for more information
    IPython 6.0.0.dev -- 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.