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Execute a system command

프로세스를 확인하여, 이미 동작중이면 중단 grep을 사용하여 간단하게 해결 통상 크론등에서 사용할때는 절대패스를 사용하기 때문에 /usr/bin/python /home/user/loop.py 형태가 되기 때문에 비교적(?) 안전하지만, 가령 파일 수정을 하고 있어서 vi loop.py 등의 프로세스가 있을수 있으므로 일반적인 프로그램명으로 찾으면 불안한 요소가 있다.  import osimport sys#exit_code = os.system(‘ls’) # Just execute the command, return a success/fail codeoutput = os.popen(‘ps -ef | grep AETOS loop.py | grep -cv grep’).read() # If you want to get the output data. Deprecated.print output # if process is running, it will be more than 1#sys.exit(0) 1 2 3 4 5 6 import os import sys #exit_code = os.system(‘ls’)       # Just execute the command, return a success/fail code output = os.popen(‘ps -ef | grep loop.py | grep -cv grep’).read() #…

python 명령행 인수 처리

그동안 쓸일이 없다가 명령행 인수 처리가 필요해서 찾아보니 역시나 간단했다. 다음과 같이 실행된다고 하면 python a.py dailyon 2010 입력된 인수들 dailyon 2010 등을 받아서 처리할 수 있다. C와 유사하게 argv 변수를 사용한다. 다만 sys를 import 해야 한다. #!/usr/bin/python sys import print sys.argv 실행결과 [‘a.py’, ‘dailyon’, ‘2010’] 예상했던데로 sys.argv 가 list 타입으로 처리되고, 따라서 sys.argv[0]은 실행파일명이 된다.