'Sets up forces that affect Mario\'s velocity'

def setup_forces(self):

    self.x_vel = 0
    self.y_vel = 0
    self.max_x_vel = c.MAX_WALK_SPEED
    self.max_y_vel = c.MAX_Y_VEL
    self.x_accel = c.WALK_ACCEL
    self.jump_vel = c.JUMP_VEL
    self.gravity = c.GRAVITY
