Answer
code
Work Step by Step
# 9.12 (Alternate two messages) Write a program to change, with a left mouse click,
# between two messages displayed on a canvas, “Programming is fun” and “It is fun
# to program,” as shown in Figure 9.27b–c.
from tkinter import * # Import tkinter
width = 220
height = 100
class MainGUI:
def __init__(self):
window = Tk() # Create a window
window.title("Rotating Message") # Set a title
self.on = False
self.canvas = Canvas(window, bg="white", width=width, height=height)
self.canvas.pack()
self.canvas.create_text(width / 2, height / 2, text="Programming is fun", tags="text")
# Bind canvas with mouse events
self.canvas.bind("", self.rotate)
window.mainloop() # Create an event loop
def rotate(self, event):
self.canvas.delete("text")
if self.on:
self.canvas.create_text(width / 2, height / 2, text="Programming is fun", tags="text")
else:
self.canvas.create_text(width / 2, height / 2, text="It is fun to program", tags="text")
self.on = not self.on
MainGUI()
