CODEWITHSUNDEEP
pythonpython-3.9os.system
user18209545
user18209545

Reputation:

Is there a way to test the results of an os.system() command in Python?

This is not an exact copy of my code, but it's the only idea I have regarding going about this:

import os
import re

while True:
    com = input()

    if com == "break":#Doesn't matter
        break

    run = os.system(com)
    if run == "'" + com + "' is not recognized as an internal or external command, operable program or batch file.":
        print("Error.")
    else:
        os.system(com)

And it doesn't work. I simply need a way to know if there's a way to test whether an os.system() function works, print the response if it does, and print "Error." otherwise. If it matters, I'm using python 3.9

Upvotes: -1

Views: 2460

Answers (1)

nonDucor
nonDucor

Reputation: 2093

The return of the os.system function is the return the operating system program (or command) does. Conventionally, it is 0 in case of success and a a number different from 0 if it fails. The error message that you want is not the result of the command, but what is sent to stderr (typically).

Thus, your code should be:

import os
import re

while True:
    com = input()

    if com == "break":#Doesn't matter
        break

    ret_value = os.system(com)
    if ret_value != 0:
        print(f"Error. Command returned {ret_value}")
    else:
        print("Command returned success")

Upvotes: 2

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