Stopwatch game

Stopwatch Game

import simplegui

time = 0
successful_stops = 0
total_stops = 0
running = False
minutes = 0
tens_of_seconds = 0
seconds_in_excess = 0
tenths_of_seconds = 0

def format(time):
    global minutes,tens_of_seconds,seconds_in_excess,tenths_of_seconds
    minutes = time // 600
    tens_of_seconds = (time%600)//100 
    seconds_in_excess= ((time%600)//10)%10
    tenths_of_seconds = time % 10
    return ""+str(minutes)+":"+str(tens_of_seconds)+""+ str(seconds_in_excess)+"."+str(tenths_of_seconds)
def start_button():
    global running
    running = True
    timer.start();
def stop_button():
    global running,successful_stops,total_stops,time,tenths_of_seconds
    timer.stop()
    if(running==True):
        running = False
        total_stops +=1
        if (time%10==0):
            successful_stops = successful_stops+1
           
    display_score()
def reset_button():
    global minutes,tens_of_seconds,seconds_in_excess,tenths_of_seconds
    global running,sucessful_stops,total_stops,time
    running = False
    minutes = 0
    tens_of_seconds = 0
    seconds_in_excess = 0
    tenths_of_seconds = 0
    sucessful_stops = 0
    total_stops = 0
    time = 0
    timer.stop()
def time_handler():
    global time
    time = time + 1
    
def display_score():
    global sucessful_stops,total_stops
    return ""+str(successful_stops)+"/"+str(total_stops)
    

# Handler to draw on canvas
def draw(canvas):
    canvas.draw_text(format(time), [100,112], 48, "Blue")
    canvas.draw_text(display_score(), [199,20], 30, "Teal")

# Create a frame and assign callbacks to event handlers
frame = simplegui.create_frame("Stopwatch game", 350, 200)
frame.add_button("Start", start_button)
frame.add_button("Stop", stop_button)
frame.add_button("Reset", reset_button)
frame.set_draw_handler(draw)
timer = simplegui.create_timer(100,time_handler)

# Start the frame animation
frame.start()