Chapter 13: Problem 17

How can you use an intvar object to determine which Radiobutton has been selected in a group of Radiobuttons?

Short Answer

Expert verified

Answer: To determine the selected Radiobutton using an IntVar object, follow these steps: 1. Import the tkinter library. 2. Create the main application window using tkinter. 3. Initialize an IntVar object to keep track of the selected Radiobutton. 4. Create Radiobuttons and associate the IntVar object with the 'variable' option of each Radiobutton. 5. Create a function that displays the value stored in the IntVar object, indicating the selected Radiobutton. 6. Add a Button to the window that triggers the function when clicked to display the selected Radiobutton value. 7. Run the main event loop of the tkinter window to make the interface interactive.

Step by step solution

Import tkinter library

Firstly, import the tkinter library in your Python script, which will allow you to create the GUI and Radiobuttons. ```python import tkinter as tk ```

Create the main application window

Create the main application window using tkinter, setting the title and size. ```python window = tk.Tk() window.title("Radiobutton Example") window.geometry("300x200") ```

Initialize an IntVar object

Now, create an `IntVar` object, which will be used to keep track of the selected Radiobutton. ```python selected_radio = tk.IntVar() ```

Create Radiobuttons and associate the IntVar object

Create three Radiobuttons with different text and values. We will assign the `selected_radio` IntVar object to the `variable` option of the Radiobutton, which will store the value of the currently selected Radiobutton. ```python radio1 = tk.Radiobutton(window, text="Option 1", variable=selected_radio, value=1) radio1.pack() radio2 = tk.Radiobutton(window, text="Option 2", variable=selected_radio, value=2) radio2.pack() radio3 = tk.Radiobutton(window, text="Option 3", variable=selected_radio, value=3) radio3.pack() ```

Create a function to show the selected Radiobutton

Create a function that will display the value stored in the `selected_radio` IntVar object, indicating which Radiobutton has been selected. ```python def show_selected(): print("Selected Radiobutton:", selected_radio.get()) ```

Create a Button to trigger the function

Add a Button to the window which will call the `show_selected` function when clicked, displaying the currently selected Radiobutton value. ```python button = tk.Button(window, text="Show selected", command=show_selected) button.pack() ```

Run the main event loop

Finally, run the main event loop of the tkinter window, which will make the window appear and be interactive. ```python window.mainloop() ``` By following these steps and running the script, users can now see which Radiobutton has been selected using the `IntVar` object. The value of the selected Radiobutton will be displayed in the terminal when the "Show selected" button is clicked.

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How can you use an intvar object to determine which Radiobutton has been selected in a group of Radiobuttons?

Short Answer

Step by step solution

Import tkinter library

Create the main application window

Initialize an IntVar object

Create Radiobuttons and associate the IntVar object

Create a function to show the selected Radiobutton

Create a Button to trigger the function

Run the main event loop

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