Python Tkinter progress bar: Dynamic percentage updates

Python tkinter widgets: Exercise-19 with Solution

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:

Python Code Editor:

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