[Solved] Python: How come the math operators won’t work?

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The reason the code has no affect is because you modify the value of x, a local variable to the function scope, and not the player position. Call player.setx(x) to actually update the player position after updating the local variable x. If you want to bound your positions you could also use the built in min/max methods:

   def move_left():
        x = player.xcor()
        x -= playerspeed
        player.setx(max(x, -280))

    def move_right():
        x = player.xcor()
        x += playerspeed
        player.setx(min(x, 280))

solved Python: How come the math operators won’t work?