[Solved] Identify the issue in this Tkinter code that attempts to update a label every second:import tkinter as tk root = tk.Tk() label = tk.Label(root, text="0") label.pack() def update(): label.... | Raspberry Pi

Raspberry Pi - Display and Output

Identify the issue in this Tkinter code that attempts to update a label every second:

import tkinter as tk
root = tk.Tk()
label = tk.Label(root, text="0")
label.pack()

def update():
    label.config(text="1")
    update()

update()
root.mainloop()

ALabel text is not updated because config method is incorrect

BThe update function calls itself recursively without delay, freezing the GUI

Croot.mainloop() is missing, so GUI never starts

DLabel widget is not packed, so it won't display

Step-by-Step Solution

Solution:

Step 1: Analyze the update function
The function calls itself recursively without any delay or event scheduling.
Step 2: Effect on GUI
This causes the program to enter an infinite recursive loop, freezing the GUI and preventing mainloop from running properly.
Final Answer:
The update function calls itself recursively without delay, freezing the GUI -> Option B
Quick Check:
Recursive calls without delay block event loop [OK]

Quick Trick: Avoid infinite recursion; use after() for scheduling [OK]

Common Mistakes:

MISTAKES

Forgetting to use root.after() for timed updates
Calling update() recursively without pause
Misunderstanding mainloop's role in GUI responsiveness

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More Raspberry Pi Quizzes

Identify the issue in this Tkinter code that attempts to update a label every second:

Step 1: Analyze the update function

Step 2: Effect on GUI

Final Answer:

Quick Check:

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