How to save cmd output to text file through another script python

Question

I am able to save the cmd data onto a text file using the following command:

python code_3.py > output.txt

However I am calling code_3.py from primary_script.py by writing:

import code_3 os.system('loop3.py')

But I want it to perform the functionality of the what the previous line does. This doesn't work:

os.system('loop3.py > opt.txt ')

Can someone please tell me what to do?

You should probably be using the subprocess module, os.system is pretty much deprecated. — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Nov 22, 2017 at 1:17
Does this answer your question: stackoverflow.com/questions/7353054/… — roelofs
– roelofs, Commented Nov 22, 2017 at 1:17

martineau · Accepted Answer · 2017-11-22 01:33:36Z

Here's how to do it with the subprocess module:

import subprocess import sys p1 = subprocess.Popen([sys.executable, "loop3.py"], stdout=subprocess.PIPE) output, err = p1.communicate() with open('opt.txt', 'w') as file: file.write(output.decode())

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