import asyncioasync def foo():    return 42asyncio.get_event_loop().run_until_complete(foo())

---------------------------------------------------------------------------RuntimeError                              Traceback (most recent call last)<ipython-input-5-3ad9bf216544> in <module>()----> 1 asyncio.get_event_loop().run_until_complete(foo())/usr/local/lib/python3.6/asyncio/base_events.py in run_until_complete(self, future)    452         future.add_done_callback(_run_until_complete_cb)    453         try:--> 454             self.run_forever()    455         except:    456             if new_task and future.done() and not future.cancelled():/usr/local/lib/python3.6/asyncio/base_events.py in run_forever(self)    406         self._check_closed()    407         if self.is_running():--> 408             raise RuntimeError('This event loop is already running')    409         if events._get_running_loop() is not None:    410             raise RuntimeError(RuntimeError: This event loop is already running