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These examples coming from:
https://docs.python.org/3/library/asyncio-eventloop.html#example-hello-world-callback
and
https://docs.python.org/3/library/asyncio-eventloop.html#example-set-signal-handlers-for-sigint-and-sigterm
throw resource usage warning.
One of them gives this output:
Event loop running forever, press CTRL+c to interrupt.
pid 3075: send SIGINT or SIGTERM to exit.
^Cgot signal SIGINT: exit
sys:1: ResourceWarning: unclosed <socket object at 0x7f7124783448>
sys:1: ResourceWarning: unclosed <socket object at 0x7f7124c230e8>
The patch adds closing the loop code in the examples.

New changeset f6827c6b1164 by Victor Stinner in branch '3.4':
Closes #21921: Fix ResourceWarning in the asyncio examples: close the event
http://hg.python.org/cpython/rev/f6827c6b1164
New changeset 0533f148fb49 by Victor Stinner in branch 'default':
(Merge 3.4) Closes #21921: Fix ResourceWarning in the asyncio examples: close
http://hg.python.org/cpython/rev/0533f148fb49 

Thanks for the fix. I already suggested it to Guido van Rossum a few months ago, but he preferred the keep the example simple. I made the same fix in the 2 hello world examples of the Tulip project last Tuesday, so it's fair to apply the same fix to asyncio examples.
Thanks for the fix Vajrasky.