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"""Print 'Hello World' every two seconds, using a coroutine."""
import trollius
from trollius import From
@trollius.coroutine
def greet_every_two_seconds():
while True:
print('Hello World')
yield From(trollius.sleep(2))
if __name__ == '__main__':
loop = trollius.get_event_loop()
try:
loop.run_until_complete(greet_every_two_seconds())
finally:
loop.close()
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