pexpect_eof_async.py

#!/usr/bin/env python3
import asyncio
import sys
import pexpect
    
@asyncio.coroutine
def run():
    cmd = ' '.join([
        sys.executable,
        '-c \'raise SystemExit("Blorp")\''
    ])

    p = pexpect.spawn(cmd)
 
    while True:
        try:
            _ = yield from p.expect_exact('\r', async=True)
            print("1. before: {:s}".format(repr(p.before)))
        except pexpect.EOF as e:
            print("2. before: {:s}".format(repr(p.before)))
            break

def main():
    loop = asyncio.get_event_loop()
    loop.run_until_complete(run())
    loop.close()

if __name__ == '__main__':
    main()