Running subprocess from nonmain thread

gistfile1.txt

from asyncio import *


@coroutine
def coro():
    proc = yield from create_subprocess_exec('true')
    yield from proc.wait()
    print('subprocess returncode', proc.returncode)

def thr():
    subloop = new_event_loop()
    set_event_loop(subloop)
    try:
        subloop.run_until_complete(coro())
    finally:
            subloop.close()


@coroutine
def main():
    return main_loop.run_in_executor(None, thr)


main_loop = get_event_loop()
get_child_watcher()  # !!! Required for attaching child watcher to main loop
try:
    main_loop.run_until_complete(main())
finally:
    main_loop.close()