What is StringIO in python used for in reality?

Question

I am not a pro and I have been scratching my head over understanding what exactly StringIO is used for. I have been looking around the internet for some examples. However, almos

Answer 1

Django has a function call_command which is used to call management commands. This function prints output to stdout and doesn't return any value. If you want to know whether the command ran successfully or not, you have to look into output and decide.

Using StringIO, you can capture output and check if it is desired output or not.

with io.StringIO() as output:
    call_command('custom_command', stdout=output)
    if 'Success' not in output.getvalue():
        print('Custom command failed...')