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__all__ = 'run',
from . import coroutines
from . import events
def run(main, *, debug=False):
"""Run a coroutine.
This function runs the passed coroutine, taking care of
managing the asyncio event loop and finalizing asynchronous
generators.
This function cannot be called when another asyncio event loop is
running in the same thread.
If debug is True, the event loop will be run in debug mode.
This function always creates a new event loop and closes it at the end.
It should be used as a main entry point for asyncio programs, and should
ideally only be called once.
Example:
async def main():
await asyncio.sleep(1)
print('hello')
asyncio.run(main())
"""
if events._get_running_loop() is not None:
raise RuntimeError(
"asyncio.run() cannot be called from a running event loop")
if not coroutines.iscoroutine(main):
raise ValueError("a coroutine was expected, got {!r}".format(main))
loop = events.new_event_loop()
try:
events.set_event_loop(loop)
loop.set_debug(debug)
return loop.run_until_complete(main)
finally:
try:
loop.run_until_complete(loop.shutdown_asyncgens())
finally:
events.set_event_loop(None)
loop.close()
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