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I want to write a python script that pipes a value of a variable (e.g. var = 5) into an external program. I want to store that output then in a .txt file. Since I want to run a couple of these processes simultaneously I tried to do this using subprocess. But I failed. Can someone help me?

Thanks a lot!

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    Edit your post and add the code ... Commented Jan 31, 2016 at 20:00
  • Possible duplicate Commented Feb 1, 2016 at 12:23
  • Something like this? from subprocess import check_output # ls command out = check_output(["ls", "-als"]) # open the empty file logfilewriteout = open("/Users/youruser/Desktop/test.txt", 'w') logfilewriteout.write(out) logfilewriteout.close() Commented Feb 1, 2016 at 12:44
  • Many questions here: 1. How to pass var's value to a subprocess (too broad: how do you want to pass it: as a command-line parameter Popen(['command', str(var)], ...), or via subprocess' stdin e.g., as var's text ascii representation print(var, file=process.stdin), or using some other IPC method?) 2. How to redirect subprocess' stdout to a file 3. How to run subprocesses in parallel. Please, limit your question to one issue per question. Commented Feb 1, 2016 at 20:31
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