← VCE Software Development U3O1

Creating a tkinter window

Creates the main tkinter window after import tkinter as tk. Call root.mainloop() at the end to show the window and wait for events like clicks.

Part of: VCE Software Development - U3O1 - Programming — Module 124, VCE Software Development - U4O1 - development and evaluation — Module 87, QCE Digital Solutions Unit 1 — User Experiences and Interfaces — Module 59, QCE Digital Solutions Unit 1 — Algorithms and Programming Techniques — Module 89, QCE Digital Solutions Unit 1 — Programmed Solutions — Module 48, QCE Digital Solutions Unit 3 — Innovative Digital Solutions — Module 52, WA Computer Science ATAR Year 11 — Control Structures and Data Types — Module 100

Understanding Creating a tkinter window in VCE Software Development U3O1

What it does: root.title() takes a string and displays it in the title bar of the window created with tk.Tk(). tk.Tk() creates the main window object. There is no tk.window() function in tkinter. The module is called tkinter. 'as tk' gives it the short name tk, so tk.Tk() works. mainloop() starts waiting for events and runs until the window is closed. root must exist first, and any setup code placed after mainloop() would not run until the window closes. The title() method sets the title bar text. tkinter has no name() method for this. geometry() takes ONE string in the form 'widthxheight', such as '400x300'. It does not take two separate numbers.

Common mistakes: The window class is Tk with a capital T. tk.tk() causes an AttributeError. It should be root = tk.Tk(). Python is case-sensitive and the method name is all lowercase. root.Title does not exist. It should be root.title("Quiz").

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Learning
Duo
Which line creates the main tkinter window?
root = tk.window()root = tk.Tk()
Matches
import tkinter as tk root = tk.Tk() root.mainloop() root.title("Quiz")
↓
root.mainloop() is placed before root.title(), so the title line only runs after the window is closed. mainloop() must be the last line.
Applying
Meanings
Term
root = tk.Tk()
Meaning
Creates the main tkinter window after import tkinter as tk. Call root.mainloop() at the end to show the window and wait for events like clicks.
Practice
import tkinter as tk
Testing
Gaps
tkinter as tk
Check Answer
Spots
1import tkinter as tk
2root = tk.tk()

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Quick Questions

1. Which line creates the main tkinter window?
A. root = tk.Tk() ✓
B. root = tk.window()
tk.Tk() creates the main window object. There is no tk.window() function in tkinter.
2. Which import lets you write tk.Tk() in your code?
A. import tkinter as tk ✓
B. import tk as tkinter
The module is called tkinter. 'as tk' gives it the short name tk, so tk.Tk() works.
3. Where should root.mainloop() go in a simple tkinter program?
A. At the start, before root = tk.Tk()
B. At the end, after the window is set up ✓
mainloop() starts waiting for events and runs until the window is closed. root must exist first, and any setup code placed after mainloop() would not run until the window closes.
4. What does root.mainloop() do?
A. Repeats the program code ten times
B. Shows the window and waits for events like clicks ✓
mainloop() keeps the window open and listens for events such as clicks and key presses until the window is closed.
5. Which line sets the text in the window's title bar to 'My App'?
A. root.title('My App') ✓
B. root.name('My App')
The title() method sets the title bar text. tkinter has no name() method for this.

Match the Pairs

root = tk.Tk() → Creates the main tkinter window and stores it in the variable root
root.mainloop() → Shows the window and waits for events such as clicks and key presses
Set the text shown in the title bar of the window → root.title("My App")
Set the window size to 400 pixels wide and 300 pixels high → root.geometry("400x300")
import tkinter as tk root = tk.Tk() root.mainloop() root.title("Quiz") → root.mainloop() is placed before root.title(), so the title line only runs after the window is closed. mainloop() must be the last line.
import tkinter as tk root = tk.Tk root.mainloop() → tk.Tk is missing its brackets, so no window is created. It should be tk.Tk().

Key Term

root = tk.Tk()
Creates the main tkinter window after import tkinter as tk. Call root.mainloop() at the end to show the window and wait for events like clicks.

Fill in the Blanks

1. import tkinter as tk root = tk.Tk() root.mainloop()
Hint: Type the keyword that loads the tkinter module into your program
2. import tkinter as tk root = tk.Tk() root.mainloop()
Hint: Type the tkinter class name that creates the main window
3. import tkinter as tk root = tk.Tk() root.mainloop()
Hint: Type the method that shows the window and waits for events like clicks
4. root = tk.Tk() root.title("My App") root.mainloop()
Hint: Type the method that sets the text shown in the window's title bar
5. root = tk.Tk() root.geometry("400x300") root.mainloop()
Hint: Type the method that sets the window's width and height

Spot the Error

Question 1
A import tkinter as tk
B root = tk.tk()
C root.title("My App")
D root.mainloop()
Line B — The window class is Tk with a capital T. tk.tk() causes an AttributeError. It should be root = tk.Tk().
Question 2
A import tkinter as tk
B root = tk.Tk()
C root.Title("Quiz")
D root.mainloop()
Line C — Python is case-sensitive and the method name is all lowercase. root.Title does not exist. It should be root.title("Quiz").
Question 3
A import tkinter as tk
B root = tk.Tk()
C root.geometry("400x300")
D root.mainloop
Line D — Without brackets, mainloop is not called, so the window closes straight away. It should be root.mainloop().
Question 4
A import tkinter as tk
B root = tk.Tk()
C root.geometry("400,300")
D root.mainloop()
Line C — The size string must be width x height with a lowercase x between the numbers, not a comma. It should be root.geometry("400x300").
Question 5
A import Tkinter as tk
B root = tk.Tk()
C root.title("Game")
D root.mainloop()
Line A — In Python 3 the module name is all lowercase. Tkinter with a capital T causes a ModuleNotFoundError. It should be import tkinter as tk.

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