Question

I want to check which Window Manager the user is using (like GNOME or KDE etc.). How do I do that?

Answer 1

You can t. There is no central place where a program registers itself to say "hi, I m the window manager".

For instance, I m running xmonad. I simply start this by calling xmonad in my ~/.xsession file along with a couple of other programs to have it start when I login. You cannot really detect that.

Answer 2

Since you re apparently using linux, you could use wmctrl -m or inxi -Sxx.

import subprocess

def get_wm():

    output = subprocess.run([ wmctrl ,  -m ], text=True,
                        stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    if output.stderr:
        return(output.stderr)
    else:
        return(output.stdout)

print(get_wm())

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