8/25/2023 0 Comments Python subprocess in background![]() ![]() ![]() ![]() Stdout get updated every 0.5 seconds for every two lines to contain: 0Īnd each log file contains the respective log for a given process. T2 = threading.Thread(target=output_reader, args=(proc2, file2)) In the previous examples we ran the external command and then waited till it finishes before doing anything else. T1 = threading.Thread(target=output_reader, args=(proc1, file1)) Subprocess.Popen(, stdout=subprocess.PIPE, stderr=subprocess.PIPE) as proc2, \ With subprocess.Popen(, stdout=subprocess.PIPE, stderr=subprocess.PIPE) as proc1, \ The threading module allows us to do that.įirst, have a look at how to do the output redirection part alone in this question: Python Popen: Write to stdout AND log file simultaneously How are you using subprocess to call your exe file Typically, you would do something like result n ( '', captureoutputTrue) output result.stdout The output variable will now contain whatever your exe spat out.For example, I wanted to launch two processes that talk over a port between them, and save their stdout to a log file and stdout. However, there are cases where you need this. Both capture output and run on background with threadingĪs mentioned on this answer, if you capture the output with stdout= and then try to read(), then the process blocks. ![]()
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