Why is there a dash in ttk radio button when made with a function?

Maior 0
Viewed 27

When I make two sets of the same radio buttons there will be a dash in one of the buttons created from a function.

import tkinter as tk
from tkinter import ttk


def add_radio_buttons():
    a_b = tk.StringVar()
    a_button = ttk.Radiobutton(window, text="A", value="A", variable=a_b)
    a_button.grid(row=1, column=1)
    a_button.invoke()
    b_button = ttk.Radiobutton(window, text="B", value="B", variable=a_b)
    b_button.grid(row=1, column=2)


window = tk.Tk()

add_radio_buttons()

a_b_too = tk.StringVar()
a_button = ttk.Radiobutton(window, text="A", value="A", variable=a_b_too)
a_button.grid(row=2, column=1)
a_button.invoke()
b_button = ttk.Radiobutton(window, text="B", value="B", variable=a_b_too)
b_button.grid(row=2, column=2)

window.mainloop()

Is this a bug or am I forgetting something?

ttk radio-button python
1 Answers

You are using local variables for the StringVar instances so the objects are being destroyed by the garbage collector. You need to use global variables or instance variables to keep a persistent copy of the variable objects.

Bryan Oakley0
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