import logging
import traceback
import subprocess
import threading
import time

logging.basicConfig(level=logging.DEBUG, format='(%(threadName)s) %(message)s')

def print_ps():
    for i in range(10):
        logging.debug(i)
        try:
            cmd = ['ps', '-ef']

            buf = subprocess.check_call(cmd)
            print(buf)

        except:
            logging.debug(traceback.format_exc())

        time.sleep(1)
    # End of for

#
# main
#
logging.debug("Start");

thread = threading.Thread(target=print_ps)
thread.start()

# スレッド終了待ち
thread.join()

logging.debug("End");

(MainThread) Start
(Thread-1) 0
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 1
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 2
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 3
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 4
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 5
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 6
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 7
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 8
UID        PID  PPID  C STIME TTY          TIME CMD
...
(Thread-1) 9
UID        PID  PPID  C STIME TTY          TIME CMD
...
(MainThread) End