In the world of programming, graphical user interfaces play a crucial role in providing an interactive and user-friendly experience. One such popular library in Python that allows us to create GUI applications easily is the **Tkinter**. Today, we will explore how to create a Tkinter button, and upon clicking it, a label would be displayed. We will dissect the different components of the code and learn about the usage and importance of specific functions and libraries.
Tkinter: An Overview
Tkinter stands for “Tk Interface,” and it is the standard Python interface to the Tk GUI toolkit. It is available on most Unix platforms, as well as macOS and Windows. Tkinter provides a variety of controls, such as buttons, labels, and text boxes used in a GUI application. These controls are called widgets whereby each widget plays a specific role in providing functionality and interaction to the applications.
Creating a Button with a Click Event to Show a Label
To accomplish the task of creating a Tkinter button that shows a label when clicked, we need to follow these steps:
1. Import the required libraries.
2. Create a top-level window object.
3. Create a button widget and setup its click event.
4. Create a label widget and define the text to be displayed.
5. Add the label and button widgets into the window.
6. Start the main event loop.
import tkinter as tk
def on_button_click():
label.config(text="Button clicked!")
root = tk.Tk()
button = tk.Button(root, text="Click me!", command=on_button_click)
button.pack()
label = tk.Label(root, text="Label will update when button clicked")
label.pack()
root.mainloop()
Let’s dive into the step-by-step explanation of the code above.
Understanding the Code
First, we import the Tkinter library as follows:
import tkinter as tk
Then we create a function called on_button_click() that will be responsible for changing the text of the label when the button is clicked. We will configure the label using the “config()” method to update its “text” attribute:
def on_button_click():
label.config(text="Button clicked!")
Next, we create the top-level window object “root” using the following command:
root = tk.Tk()
After that, we create the button widget and set its text attribute to “Click me!”. We also pass the on_button_click() function to the Command attribute, so that it gets executed upon the button click:
button = tk.Button(root, text="Click me!", command=on_button_click) button.pack()
Now we create the label widget with its initial text set as “Label will update when button clicked”, and then add it to the window using pack():
label = tk.Label(root, text="Label will update when button clicked") label.pack()
Finally, we start the main event loop with the following line:
root.mainloop()
Upon executing the code, a window with a button and a label will appear. Once the button is clicked, the label’s text will change according to the function’s definition.
With this implementation, we successfully created a simple yet interactive application using various Tkinter components, such as buttons, labels, and events, giving users a glimpse of the powerful world of graphical user interfaces.
