How to display output of command in python

Question

I want to run the command df -h to display disk information, But when i run my code nothing is displayed in the terminal, I even tried to do "df -h > out.txt" and then cat out.txt but that didn't work either.

import sys
import os
import subprocess


def main():
    os.system('clear')
    print("Options: \n")
    print("1 - Show disk info")
    print("2 - Quit \n")
    selection = input('> ')
    if selection == 1:
        subprocess.call(['df -h'], shell=True)
    elif selection == 2:
        sys.exit(0)

if __name__ == "__main__":
    main()

MattDMo · Accepted Answer · 2014-01-06 22:18:55Z

1

Reading user input with input() returns a string. However, your if/elif statement are comparing the contents of selection with integers, so the comparison will always be False. As a workaround, use this:

selection = int(input('> '))
if selection == 1:
   ...

answered Jan 6, 2014 at 22:18

MattDMo

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1 Comment

MattDMo Over a year ago

no worries, we've all done it. This is why interactive development is so important - running type(selection) or even print(selection) would show you what you need to know.

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