Python: What OS am I running on?

Question

What do I need to look at to see whether I\'m on Windows or Unix, etc?

Answer 1

/usr/bin/python3.2

def cls():
    from subprocess import call
    from platform import system

    os = system()
    if os == 'Linux':
        call('clear', shell = True)
    elif os == 'Windows':
        call('cls', shell = True)