What if you need to run python script only if it's not already running? Or kill old copy before run new one? One of the way is:
- Check if special file exists. If it's true, one copy of script is already running. Now kill it or exit from second copy.
- Create temporary file with PID of script process.
- Delete pid-file at the end of the script.
Here is the code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | import tempfile import ctypes import os # Path to file storing PID of running script process. # Place it outside of methods in the beggining, or make sure it visible for all methods, which use it. pid_file = tempfile.gettempdir() + 'tmp_armor_pid.txt' # This method checks if file pid_file exists. # If it was found, depends of mode - exit, or kill process which PID is stored in file. def scriptStarter(mode = 'force'): ''' if mode = force - kill runing script and run new one if mode != force - run script only if it's not already running ''' if os.path.exists(pid_file): print 'old copy found' if mode == 'force': print 'running copy found, killing it' # reading PID from file and convert it to int pid = int((open(pid_file).read())) print 'pid have been read:', pid # If you use pythton 2.7 or above just use os.kill to terminate PID process. # In case of python 2.6 run method killing selected PID kill(pid) else: print 'running copy found, leaving' # not force mode. Just don't run new copy. Leaving. raise SystemExit # If we are here, mode == force, old copy killed, writing PID for new script process open(pid_file, 'w').write(str(os.getpid())) def kill(pid): """kill function for Win32""" kernel32 = ctypes.windll.kernel32 handle = kernel32.OpenProcess(1, 0, pid) return (0 != kernel32.TerminateProcess(handle, 0)) # Delete pid-file befor script finish. # Dont forget to run this method at the end of the script # If you use PyQt call it in overloaded closeEvent() def removePIDfile(): print 'deleting pidfile' try: os.remove(pid_file) except OSError: pass return def main(): # check if script is already running scriptStarter('force') '''YOUR SCRIPT CODE HERE''' # remove pid-file before exit. removePIDfile() if __name__=="__main__": main() |
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