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

Based on the step-by-step solution above, the short answer is: To determine which Radiobutton is selected in a group of Radiobuttons using an IntVar object, complete the following steps: 1. Import the necessary Tkinter objects: Tk, Radiobutton, and IntVar. 2. Create a main window by instantiating an object of the Tk class. 3. Create an IntVar object to store the selected Radiobutton value. 4. Create Radiobuttons, associating them with the IntVar object using the `variable` parameter and setting their unique identifiers using the `value` parameter. 5. Place the Radiobuttons in the main window using the `pack()` method. 6. Call the `get()` method on the IntVar object to obtain the value of the selected Radiobutton. 7. Display the main window by calling the `mainloop()` method on the Tk object.

Step by step solution

Import Tkinter

First, we need to import the Tkinter module, which is a standard Python library for creating graphical user interfaces (GUIs). We will be using the `Radiobutton` and `IntVar` widgets and the `Tk` class. Here's the import statement we need: ```python from tkinter import Tk, Radiobutton, IntVar ```

Create the main window

Next, we create the main window by instantiating an object of the Tk class. This serves as a container for all the widgets in our application. ```python root = Tk() ```

Create an IntVar object

In this step, create an IntVar object that will be associated with the Radiobuttons to store the selected value. ```python selected_value = IntVar() ```

Create Radiobuttons with the IntVar

Now, create the Radiobuttons and associate them with the IntVar object using the `variable` parameter. The `value` parameter of each Radiobutton determines its unique identifier, which will be stored in the IntVar object when the Radiobutton is selected. ```python radiobutton_one = Radiobutton(root, text="Option 1", variable=selected_value, value=1) radiobutton_two = Radiobutton(root, text="Option 2", variable=selected_value, value=2) radiobutton_three = Radiobutton(root, text="Option 3", variable=selected_value, value=3) ```

Place the Radiobuttons in the main window

Place the Radiobuttons in the main window using the `pack()` method. This method is used to pack the widgets vertically in the main window. ```python radiobutton_one.pack() radiobutton_two.pack() radiobutton_three.pack() ```

Determine the selected Radiobutton

To find out which Radiobutton is currently selected, we can simply call the `get()` method on the IntVar object. This will return the value of the selected Radiobutton. ```python print("Selected value:", selected_value.get()) ```

Display the main window

Finally, use the `mainloop()` method to display the main window and start the event loop. This method is required for the application to run properly. ```python root.mainloop() ``` By following these steps, you can use an IntVar object to determine which Radiobutton is selected in a group of Radiobuttons.

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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

Create the main window

Create an IntVar object

Create Radiobuttons with the IntVar

Place the Radiobuttons in the main window

Determine the selected Radiobutton

Display the main window

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