wait process until all subprocess finish

Question

I have a main process which creates two or more sub processes  I want  main process to wait until all sub processes finish their operations and exits      main script py   p1   subprocess Popen   python script1 py      p2   subprocess Popen   python script2 py            wait main process until both p1  p2 finish

User · Answer

subprocess call   Automatically waits   you can also use   p1 wait

User · Answer

A Popen object has a  wait   method exactly defined for this  to wait for the completion of a given subprocess  and  besides  for retuning its exit status    If you use this method  you ll prevent that the process zombies are lying around for too long    Alternatively  you can use subprocess call   or subprocess check call   for calling and waiting  If you don t need IO with the process  that might be enough  But probably this is not an option  because your if the two subprocesses seem to be supposed to run in parallel  which they won t with  check  call      If you have several subprocesses to wait for  you can do  exit codes    p wait   for p in p1  p2    which returns as soon as all subprocesses have finished  You then have a list of return codes which you maybe can evaluate

[python] wait process until all subprocess finish?

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