Python Tkinter progress bar: Dynamic percentage updates

Last update on April 25 2025 12:57:45 (UTC/GMT +8 hours)

Write a Python GUI program to create a Progress bar widget that updates based on a given percentage using tkinter module.

Sample Solution:

Python Code:

import tkinter as tk
from tkinter import ttk

def update_progress():
    new_value = progress_var.get()
    new_value += 10
    if new_value > 100:
        new_value = 0
    progress_var.set(new_value)
    progress_bar["value"] = new_value
    parent.after(1000, update_progress)  # Update every 1000 milliseconds (1 second)

parent = tk.Tk()
parent.title("Progress Bar Example")

# Create a Progress Bar widget
progress_var = tk.DoubleVar()
progress_bar = ttk.Progressbar(parent, variable=progress_var, maximum=100)
progress_bar.pack(padx=20, pady=20, fill="x")

# Create a button to update the progress bar
update_button = tk.Button(parent, text="Update Progress", command=update_progress)
update_button.pack()
parent.after(1000, update_progress)  # Start updating the progress bar
parent.mainloop()

Explanation:

In the exercise above -

Import 'tkinter' as 'tk' and 'ttk' for creating GUI components.
Define a function "update_progress()" that updates the progress bar's value. It increments the progress by 10 units and resets it to 0 when it reaches 100. The "after()" method schedules the next update after 1000 milliseconds (1 second).
Create the main window using tk.Tk() and set its title.
Create a DoubleVar named 'progress_var' to hold the progress bar's value.
Create a Progress Bar widget named 'progress_bar' and associate it with progress_var. The maximum parameter sets the progress bar maximum value to 100.
Create a button named 'update_button' that, when clicked, calls the 'update_progress' function to update the progress bar.
We use the "after()" method to update the progress bar every 1000 milliseconds (1 second).
The main event loop, parent.mainloop(), starts the Tkinter application.

Sample Output:

Flowchart:

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