10.3 프로그램과 프로세스

22 Mar 2018 • IntroducingPython 
import os
os.getpid()

657

os.getcwd()

‘/home/sumin/projects/python/IntroducingPython/10. 시스템’

os.getuid()

1000

os.getgid()

1000

10.3.1 프로세스 생성하기(1): subprocess

  • 파이썬 표준 라이브러리의 subprocess 모듈로 존재하는 다른프로그램을 시작하거나 멈출 수 있다. 
    import subprocess
ret = subprocess.getoutput('date')
ret

    ‘2018. 03. 05. (월) 17:28:14 KST’

    ret = subprocess.getoutput('date -u')
ret

    ‘2018. 03. 05. (월) 08:28:41 UTC’

    ret = subprocess.getoutput('date -u | wc')
ret

    ’ 1 6 33’

    ret = subprocess.check_output(['date', '-u'])
ret

    b’2018. 03. 05. (\xec\x9b\x94) 08:30:00 UTC\n’

    ret = subprocess.getstatusoutput('date')
ret

    (0, ‘2018. 03. 05. (월) 17:30:42 KST’)

    ret = subprocess.call('date')

    ret

    0

    print(subprocess.call('date -u', shell=True))

    0

    ret = subprocess.call(['date', '-u'])

    ret

    0

    10.3.2 프로세스 생성하기(2): multiprocessing

import multiprocessing
import os
def do_this(what):
whoami(what)

def whoami(what):
print('Process %s says %s' % (os.getpid(), what))

if __name__ == '__main__':
whoami("I'm the main program")
for n in range(4):
p = multiprocessing.Process(target=do_this, args=("I'm function %s" % n,))
p.start()

Process 657 says I’m the main program Process 855 says I’m function 2 Process 858 says I’m function 3 Process 853 says I’m function 1 Process 851 says I’m function 0

10.3.3 프로세스 죽이기: terminate()

import multiprocessing
import time
import os
def whoami(name):
print("I'm %s, in process %s" % (name, os.getpid()))

def loopy(name):
whoami(name)
start = 1
stop = 100000
for num in range(start, stop):
print("\tNumber %s of %s, Honk!" % (num, stop))
time.sleep(1)
if __name__ == '__main__':
whoami("main")
p = multiprocessing.Process(target=loopy, args=("loopy",))
p.start()
time.sleep(5)
p.terminate()

I’m main, in process 657 I’m loopy, in process 965 Number 1 of 100000, Honk! Number 2 of 100000, Honk! Number 3 of 100000, Honk! Number 4 of 100000, Honk! Number 5 of 100000, Honk!

 IntroducingPython

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