Python Programming for Raspberry Pi, Sams Teach Yourself in 24 Hours

Click here to view code image

menubar = Menu(self)

filemenu = Menu(menubar)

filemenu.add_command(label='Convert', command=self.convert)

filemenu.add_command(label='Clear', command=self.clear)

menubar.add_cascade(label='File', menu=filemenu)

menubar.add_command(label='Quit', command=root.quit)

root.config(menu=menubar)

After you create the drop-down menu, you use the add_cascade() method to add it to the top-
level menu bar and assign it a label.

Now that you’ve learned about the popular widgets that you’ll use in your programs, you can work
out a real program to test them out!

Try It Yourself: Create a Python GUI Program

In the following steps, you’ll create a GUI application that can calculate your bowling

average after three games. Just follow these steps to get your program up and running:

1. Create a file called script1809.py in the folder for this hour.


2. Open the script1809.py file and enter the code shown here:
   Click here to view code image
   #!/usr/bin/python3
   from tkinter import *
   class Application(Frame):
   """Build the basic window frame template"""
   def init(self, master):
   super(Application, self).init(master)
   self.grid()
   self.create_widgets()
   def create_widgets(self):
   menubar = Menu(self)
   filemenu = Menu(menubar)
   filemenu.add_command(label='Calculate', command=self.calculate)
   filemenu.add_command(label='Reset', command=self.clear)
   menubar.add_cascade(label='File', menu=filemenu)
   menubar.add_command(label='Quit', command=root.quit)
   self.label1 = Label(self, text='The Bowling Calculator')
   self.label1.grid(row=0, columnspan=3)
   self.label2 = Label(self, text="Enter score from game 1:")
   self.label3 = Label(self, text='Enter score from game 2:')
   self.label4 = Label(self, text='Enter score from game 3:')
   self.label5 = Label(self, text="Average:")
   self.label2.grid(row=2, column=0)
   self.label3.grid(row=3, column=0)
   self.label4.grid(row=4, column=0)
   self.label5.grid(row=5, column=0)
   self.score1 = Entry(self)
   self.score2 = Entry(self)
   self.score3 = Entry(self)
   self.average = Entry(self)
   self.score1.grid(row=2, column=1)
   self.score2.grid(row=3, column=1)