问题
Tried searching for the solution to this problem but due to there being a command Shell=True (don't think that is related to what I'm doing but I could well be wrong) it get's lots of hits that aren't seemingly useful.
Ok so the problem I is basically:
I'm running a Python script on a cluster. On the cluster the normal thing to do is to launch all codes/etc. via a shell script which is used to request the appropriate resources (maximum run time, nodes, processors per node, etc.) needed to run the job. This shell then calls the script and away it goes.
This isn't an issue, but the problem I have is my 'parent' code needs to wait for it's 'children' to run fully (and generate their data to be used by the parent) before continuing. This isn't a problem when I don't have the shell between it and the script but as it stands .communicate() and .wait() are 'satisfied' when the shell script is done. I need to to wait until the script(s) called by the shell are done.
I could botch it by putting a while loop in that needs certain files to exist before breaking, but this seems messy to me.
So my question is, is there a way I can get .communicate (idealy) or .wait or via some other (clean/nice) method to pause the parent code until the shell, and everything called by the shell, finishes running? Ideally (nearly essential tbh) is that this be done in the parent code alone.
I might not be explaining this very well so happy to provide more details if needed, and if somewhere else answers this I'm sorry, just point me thata way!
来源：https://stackoverflow.com/questions/28905334/python-communicate-wait-with-a-shell-subprocess