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Inputhook for running the original asyncio event loop while we're waiting for
input.
By default, in IPython, we run the prompt with a different asyncio event loop,
because otherwise we risk that people are freezing the prompt by scheduling bad
coroutines. E.g., a coroutine that does a while/true and never yield back
control to the loop. We can't cancel that.
However, sometimes we want the asyncio loop to keep running while waiting for
a prompt.
The following example will print the numbers from 1 to 10 above the prompt,
while we are waiting for input. (This works also because we use
prompt_toolkit`s `patch_stdout`)::
In [1]: import asyncio
In [2]: %gui asyncio
In [3]: async def f():
...: for i in range(10):
...: await asyncio.sleep(1)
...: print(i)
In [4]: asyncio.ensure_future(f())
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Inputhook for asyncio event loop integration.
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