from JMSSGraphics import*

ypos = 275
yvel = 0

jmss = Graphics(width = 900, height = 600, title = "Test", fps = 60)

@jmss.mainloop
def game():
    global ypos, yvel

    if ypos <= 0:
        ypos -= yvel

    jmss.clear()
    jmss.drawImage("mario.png",x = 0, y = ypos)

jmss.run()