python学习的一些感悟

#timer


import simplegui
import random

# global state

message = "Python is Fun!"
position = [50, 50]
width = 500
height = 500
interval = 2000

#Handler for text box
def update(text):
    global message
    message = text
    
#Handler for timer
def tick():
    x = random.randrange(0, width)
    y = random.randrange(0, height)
    position[0] = x
    position[1] = y
    
#Handler for draw on canvas
def draw(canvas):
    canvas.draw_text(message, position, 36, "Yellow")
    
#Create a frame
frame = simplegui.create_frame("Home", width, height)

#Register event handler
text = frame.add_input("Message", update, 150)
frame.set_draw_handler(draw)
timer = simplegui.create_timer(interval, tick)


frame.start()
timer.start()