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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())
- """
- def inputhook(context):
- """
- Inputhook for asyncio event loop integration.
- """
- # For prompt_toolkit 3.0, this input hook literally doesn't do anything.
- # The event loop integration here is implemented in `interactiveshell.py`
- # by running the prompt itself in the current asyncio loop. The main reason
- # for this is that nesting asyncio event loops is unreliable.
- return
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