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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Create a Tkinter radio-button group by giving each button a unique value and connecting all the buttons to the same StringVar or IntVar. Set that variable to choose a default, read the current choice with get(), and use a command callback when the interface should react to a selection.
Build a radio-button group with ttk
This runnable example creates three mutually exclusive choices, selects Python initially, and updates a label whenever the user changes the selection:
import tkinter as tk
from tkinter import ttk
root = tk.Tk()
root.title("Choose a language")
selection = tk.StringVar(value="Python")
options = ("Python", "Rust", "Go")
def show_selection():
result.config(text=f"Selected: {selection.get()}")
for option in options:
ttk.Radiobutton(
root,
text=option,
value=option,
variable=selection,
command=show_selection,
).pack(anchor="w")
result = ttk.Label(root, text=f"Selected: {selection.get()}")
result.pack(anchor="w", pady=8)
root.mainloop()Save it as a Python file and run it in an environment with Tk support. The window opens with Python selected; choosing Rust or Go changes the label. The official Python Tkinter documentation describes a Radiobutton as a widget that presents an indicator and selects one choice from several.
How the shared variable and values work
selection is the control variable shared by every button in this group. Each button’s value is what gets written to that variable when selected. Because those values are distinct, selecting one choice replaces the previous value, rather than adding another selected item.
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textis the label shown to the user.valueis the value stored for that option; it can match the label, but does not have to.variableconnects the button to the sharedStringVar.commandnames a function to call after a user changes the selection.
Set the variable to one of the buttons’ values to establish a default selection, as tk.StringVar(value="Python") does above. If an answer is required but no default should be selected, initialize and validate the variable deliberately instead of assuming the user has chosen an option.
Read the selected value
Call selection.get() wherever you need the current choice. In the example, the callback reads it after a click and updates the label. You can also call get() later—for example, in a submit handler—to use the chosen value when the user submits a form.
Use a callback correctly
Pass the function itself as the command, as in command=show_selection. Do not write command=show_selection(): the parentheses run the function immediately while constructing the widget, rather than when the user selects an option.
Keep groups independent
Buttons connected to the same variable form one choice group. For a second, independent question, create a second control variable and connect that question’s buttons to it. The classic Radiobutton reference and ttk Radiobutton reference both document the shared-variable pattern.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallKeep a Python reference to each StringVar or IntVar for as long as its widgets use it. Python’s Tkinter variable documentation warns that garbage collection of a variable removes its underlying Tcl variable and can break the widget link.
Choose between Radiobutton and ttk.Radiobutton
tk.Radiobutton is the classic widget; ttk.Radiobutton is its themed counterpart. Both use a shared control variable and distinct values for mutually exclusive choices. Choose the one that fits the visual style of the rest of your interface. The example uses ttk.Radiobutton; with classic widgets, use tk.Radiobutton(parent, text=label, variable=selection, value=option).
When radio buttons are the wrong control
Radio buttons suit a small set where exactly one option should be selected. Use checkbuttons when users may select multiple independent options. For a long list of choices, a list or dropdown can take less screen space.
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