Code: Creating a basic python game?

[ichabod801]

Also note that if a value is not 300 or less, then you already know it's over 300:

def getvalue(cpu):
    if cpu <= 300:
        value = 1
    elif cpu <= 600:
        value = 2
    else:
        value = 3
    return value

Of course, since it is even ranges, you could just divide (random.randint(1, 900) // 3 + 1).

But as I implied and stulis clarified, generating 1-900 and then shrinking it down to 1-3 is overkill. Unless that is part of the assignment?

Have you done dictionaries yet? That's the best way to handle determining who won rock-paper-scissors in my experience.