This is a series of examples showing the basics of how to write :term:`coroutines <coroutine>` and schedule them in the asyncio :term:`event loop <event loop>`.
This example uses the :py:meth:`asyncio.AbstractEventLoop.run_until_complete`
method to schedule a simple function that will wait one second, print
hello and then finish.
Because it is launched with :py:meth:`asyncio.AbstractEventLoop.run_until_complete`, the :term:`event loop <event loop>` itself will terminate once the :term:`coroutine <coroutine>` is completed.
.. literalinclude:: examples/hello_world.py
This second example shows how you can schedule multiple :term:`coroutines <coroutine>` in the event loop, and then run the :term:`event loop <event loop>`.
Notice that this example will print second_hello before first_hello,
as the first :term:`task <task>` scheduled waits longer that the second one
before printing.
Also note that this example will never terminate, as the :term:`loop <event loop>` is asked to run_forever.
.. literalinclude:: examples/create_task.py
This third example adds another :term:`task <task>` that will stop the :term:`event loop <event loop>` before all scheduled :term:`tasks <task>` could execute, which results in a warning.
.. literalinclude:: examples/loop_stop.py
Warning:
.. highlight:: none
Task was destroyed but it is pending! task: <Task pending coro=<say() done, defined at examples/loop_stop.py:3> wait_for=<Future pending cb=[Task._wakeup()]>>