How to run executable in Python 3 while passing two inputs to the prompt and redirecting output to a text file

Question

Here are the list of task I would like to automate and capture the output into a text file using Python 3:

Run the executable auth_bin
Asks for entering password
After entering the password from keyboard, it gives an output on the terminal
Asks for choosing a number
Generates a file on disk

I can automate inputing my password and the choice number with the following code, but cannot capture the output in step#3.

import subprocess from getpass import getpass choice_num = "5" mypass = getpass('Enter your password: ') subprocess.run(auth_binary, input="\n".join([mypass, choice_num]), text=True)

How can I capture screen output into a text file?

BTW, I can give two inputs (step# 2 and 4) from the keyboard and save the screen output from my Mac terminal this way:

auth_bin 2>&1 | tee output.txt

A.Ber · Accepted Answer · 2021-02-18 00:14:10Z

To capture the stream of a process, you can use subprocess.Popen, and take advantage of the 'stdout' and 'stderr' arguments to capture the outputs and errors.

There's a good example here on how to save these to a file with Python 3.

Hope this solution suits your needs.

Thanks @A.Ber for your answer. I tried it, but it does not prompt me for the password. Seems like the password prompt goes into the captured file. I experimented with subprocess.run and took the output into a variable. I can serve my purpose but needs some extra cleanup.

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