Chapter 14: 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 use an IntVar object to determine the selected Radiobutton in a group of Radiobuttons in tkinter, follow these steps: 1. Import the tkinter module. 2. Create the main window. 3. Create an IntVar object that will be used to store the selected Radiobutton's value. 4. Create a group of Radiobuttons, associate them with the IntVar object, and assign unique values for each Radiobutton. 5. Define a function that will get the selected Radiobutton's value from the IntVar object when called. 6. Create a Button to call the "get_selected_value" function when clicked. 7. Run the main loop to start the tkinter application.

Step by step solution

Import tkinter module

First, import the tkinter module to create a GUI for this example. If you are using Python 3.x or later, use "import tkinter as tk". If you are using Python 2.x, use "import Tkinter as tk".

Create the main window

Create the main window using the following code: ´´´ root = tk.Tk() root.title("Radiobutton Example") ´´´

Create an IntVar object

Now, create an IntVar object that will be used to store the currently selected Radiobutton's value. ´´´ selected_rb = tk.IntVar() ´´´

Create Radiobuttons

Create a group of Radiobuttons and associate them with the IntVar object created earlier. Assign a unique value to each Radiobutton using the "value" parameter. Also, set the "variable" parameter to the IntVar object. ´´´ rb1 = tk.Radiobutton(root, text="Option 1", variable=selected_rb, value=1) rb2 = tk.Radiobutton(root, text="Option 2", variable=selected_rb, value=2) rb3 = tk.Radiobutton(root, text="Option 3", variable=selected_rb, value=3) rb1.pack() rb2.pack() rb3.pack() ´´´

Create a function to get the selected Radiobutton's value

Define a function that will get the selected Radiobutton's value from the IntVar object when called. ´´´ def get_selected_value(): print("Selected Radiobutton:", selected_rb.get()) ´´´

Create a Button to call the function

Create a Button to call the "get_selected_value" function when clicked, and pack it in the main window. ´´´ button = tk.Button(root, text="Get Selected Value", command=get_selected_value) button.pack() ´´´

Run the main loop

Finally, run the main loop to start the tkinter application. ´´´ root.mainloop() ´´´ When the application is running, selecting a Radiobutton and clicking the "Get Selected Value" button will display the value of the selected Radiobutton in the console. This is achieved by getting the value of the IntVar object, which is associated with the 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 module

Create the main window

Create an IntVar object

Create Radiobuttons

Create a function to get the selected Radiobutton's value

Create a Button to call the function

Run the main loop

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