What a graphical user interface (GUI) is

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Quick Questions

Shade in the A or B circle for each question.

1. Which statement best describes a GUI?

A Windows and controls such as buttons and text boxes that the user clicks or types in

B A program that only shows text and takes typed commands in a console

2. In an event-driven GUI program, what does the program do after it shows the window?

A It runs every line once from top to bottom and then ends straight away

B It waits for events such as a button click, then responds to each one

3. Which of these is an event?

A The user clicks a Submit button

B A variable is given the value 10

4. What is the main purpose of a Button control?

A Lets the user trigger an action by clicking it

B Lets the user type in a line of text

5. Which control would you choose to let a user type their name?

A A Label

B A text box (Entry)

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Button(window, text="Save", command=save_data)		Adef on_click(): print("Clicked")
2window.mainloop()		Bname_box = Entry(window)
3A text box control lets the user type in a value for the program to use		CThere is no window.mainloop() at the end, so the window closes straight away and never waits for events.
4A GUI program is event-driven: it runs a function in response to a user action such as a click		DStarts the event loop so the window stays open and waits for the user to click or type
5Button(window, text="Go", command=start())		ECreates a button control that runs the save_data function when the user clicks it
6window = Tk() Label(window, text="Hi").pack()		Fstart() has brackets, so the function runs immediately when the button is created instead of on a click. Use command=start.

Definitions

GUI

Fill in the Blanks

Complete each line of code by filling in the missing parts.

import tkinter as tk root = tk.__() root.title("My App")

root = tk.Tk() btn = tk.______(root, text="Click me") btn.pack()

entry = tk._____(root) entry.pack()

def greet(): print("Hi!") btn = tk.Button(root, _______=greet)

btn.pack() root.________()

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A import tkinter as tk

B r = tk.Tk()

C btn = tk.button(r, text="Go")

D btn.pack()

E r.mainloop()

Question 2

A r = tk.Tk()

B def go():

C print("Clicked")

D b = tk.Button(r, command=go())

E b.pack()

Question 3

A import tkinter as tk

B r = tk.Tk()

C lbl = tk.Label(r, txt="Hi")

D lbl.pack()

E r.mainloop()

Question 4

A import tkinter as tk

B root = tk.Window()

C root.title("Quiz")

D root.mainloop()

Question 5

A root = tk.Tk()

B root.title("App")

C root.mainloop

D print("Closed")

Answer Key

What a graphical user interface (GUI) is

Section A: Quick Questions

A — Windows and controls such as buttons and text boxes that the user clicks or types in

B — It waits for events such as a button click, then responds to each one

A — The user clicks a Submit button

A — Lets the user trigger an action by clicking it

B — A text box (Entry)

Section B: Match the Pairs

Button(window, text="Save", command=save_data) → Creates a button control that runs the save_data function when the user clicks it

window.mainloop() → Starts the event loop so the window stays open and waits for the user to click or type

A text box control lets the user type in a value for the program to use → name_box = Entry(window)

A GUI program is event-driven: it runs a function in response to a user action such as a click → def on_click(): print("Clicked")

Button(window, text="Go", command=start()) → start() has brackets, so the function runs immediately when the button is created instead of on a click. Use command=start.

window = Tk() Label(window, text="Hi").pack() → There is no window.mainloop() at the end, so the window closes straight away and never waits for events.

Section C: Definitions

GUI — A graphical user interface: windows and controls like buttons and text boxes the user clicks or types in. The program waits for events, such as a click, and responds to each one.

Section D: Fill in the Blanks

import tkinter as tk
root = tk.Tk()
root.title("My App")

root = tk.Tk()
btn = tk.Button(root, text="Click me")
btn.pack()

entry = tk.Entry(root)
entry.pack()

def greet():
    print("Hi!")
btn = tk.Button(root, command=greet)

btn.pack()
root.mainloop()

Section E: Spot the Error

C — Python is case sensitive. The control class is Button with a capital B, so it should be tk.Button(r, text="Go").

D — The brackets call go() straight away instead of waiting for a click. The event handler must be passed without brackets: command=go.

C — A Label has no option called txt. The option that sets the displayed words is text, so it should be text="Hi".

B — The main window of a tkinter GUI is created with tk.Tk(). There is no tk.Window() class, so it should be root = tk.Tk().

C — Without brackets mainloop is never called, so the program never starts waiting for events like clicks. It should be root.mainloop().