Print output of subprocess.run AND display it on screen [duplicate]

Question

I am trying to run a shell command via subprocess.run, and I would like to redirect the output to a file, but also display it on stdout at the same time.

I have not found a way to do it, is this possible in a pure Python script?

It would be equivalent to doing some_command | tee file.txt in bash.

I could always write a wrapper bash script that will invoke the python script and call tee, but would be nice if Python had a way to do this directly.

Have you considered using 'subprocess.Popen()', and than 'subprocess.Communicate()'? — MOckjer
– MOckjer, Commented Jul 25, 2020 at 6:13

Peter Xie · Accepted Answer · 2020-07-25 07:05:54Z

You can capture the output and send to stdout and a file.

Python 3.7+:

r = subprocess.run(cmds, capture_output=True, text=True)

Python 3.5+:

r = subprocess.run(cmds, stdout=PIPE, stderr=PIPE) stdout = r.stdout.decode("utf-8") # specify encoding

Example

import subprocess r = subprocess.run(['ls'], capture_output=True, text=True) print(r.stdout) with open('a.txt','w') as f: f.write(r.stdout)

This doesn't work if I want to print the lines out while the command is running and producing output.

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