Hi, async/await syntax is a very nice recent feature, but there is something that I miss for coroutines defined with async def, as compared to generators. Coroutines represent an interesting mental model that goes beyond only asynchronous IO, so that I play with them in REPL often. But there is no built-in function to actually run a coroutine, so that typically I use something like:
>>> def run(coro): ... try: ... coro.send(None) ... except StopIteration as e: ... return e.value >>> async def f(): ... return 42 >>> run(f()) 42 There is a simple yet useful function for interactive play with generators - ``next``, but not for coroutines. There is an option to do: >>> import asyncio >>> loop = asyncio.get_event_loop() >>> loop.run_until_complete(f()) 42 But this feels a bit redundant for an interactive play. I would propose to add something like an above described ``run`` function to built-ins. Yes, I know, there is a very high bar for adding a built-in function, but I believe such a function will help to promote async/await to a wider community (especially to novices). -- Ivan
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