Answer
code
Work Step by Step
# 9.18 (Display flashing text) Write a program that displays the flashing text “Welcome,”
# as shown in Figure 9.30a–b. (Hint: To make the text flash, you need to repeatedly
# draw it on the canvas or alternately delete it. Use a Boolean variable to control the
# alternation.)
from tkinter import * # Import tkinter
width = 200
height = 100
class MainGUI:
def __init__(self):
window = Tk() # Create a window
window.title("Flashing Text") # Set a title
sleepTime = 100
canvas = Canvas(window, bg="white", width=width, height=height)
canvas.pack()
on = True
while True:
if on:
canvas.create_text(width / 2, height / 2, text="Welcome", tags="text")
else:
canvas.delete("text")
on = not on
canvas.after(sleepTime) # Sleep for 100 milliseconds
canvas.update()
window.mainloop() # Create an event loop
MainGUI()
