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Asked: 2026-05-16T14:34:28+00:00

I am using Popen to run a command but I don’t know how I

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I am using Popen to run a command but I don’t know how I can write a callback that gets called once the command is finished. Any idea?

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  1. Editorial Team

    You can call communicate():

     p = subprocess.Popen('find . -name "*.txt"', stdout=subprocess.PIPE, stderr=subprocess.PIPE)
 stdout, stderr = p.communicate()

    You can also call wait(), but this might cause problems if the child process fills its output buffer.

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