Why do all the radiobuttons start selected, and how do I stop that?-CodePudding

Below is my code. i would like to know how to start the program with the radio buttons not selected.

from tkinter import *
    
    
root = Tk()
    
root.title("Early Learning Tool")
root.geometry("800x400")
    
frame = LabelFrame(root, text="Letters", padx=30, pady=10)
frame.pack()
    
photo_A = PhotoImage(file=r"Pictures\A.png")
photo_B = PhotoImage(file=r"Pictures\B.png")
photo_C = PhotoImage(file=r"Pictures\C.png")
photo_D = PhotoImage(file=r"Pictures\D.png")
photo_E = PhotoImage(file=r"Pictures\E.png")
    
    
letter_choice = StringVar()
    
rb_A = Radiobutton(frame, variable=letter_choice, value="A", image=photo_A)
rb_A.grid(row=0, column=0)
rb_B = Radiobutton(frame, variable=letter_choice, value="B", image=photo_B)
rb_B.grid(row=0, column=1)
rb_C = Radiobutton(frame, variable=letter_choice, value="C", image=photo_C)
rb_C.grid(row=0, column=2)
rb_D = Radiobutton(frame, variable=letter_choice, value="D", image=photo_D)
rb_D.grid(row=0, column=3)
rb_E = Radiobutton(frame, variable=letter_choice, value="E", image=photo_E)
rb_E.grid(row=0, column=4)
    
root.mainloop()

This is what appears. How do I make it so it doesn't do that?

CodePudding user response：

In letter_choice variable you have to set a default value in StringVar()

like so:

letter_choice = StringVar(value="A")

CodePudding user response：

I tried running the programming switching the images to text.

from tkinter import *
    
    
root = Tk()
    
root.title("Early Learning Tool")
root.geometry("800x400")
    
frame = LabelFrame(root, text="Letters", padx=30, pady=10)
frame.pack()

letter_choice = StringVar()
    
rb_A = Radiobutton(frame, variable=letter_choice, value="A", text="A")
rb_A.grid(row=0, column=0)
rb_B = Radiobutton(frame, variable=letter_choice, value="B", text="B")
rb_B.grid(row=0, column=1)
rb_C = Radiobutton(frame, variable=letter_choice, value="C", text="C")
rb_C.grid(row=0, column=2)
rb_D = Radiobutton(frame, variable=letter_choice, value="D", text="D")
rb_D.grid(row=0, column=3)
rb_E = Radiobutton(frame, variable=letter_choice, value="E", text="E")
rb_E.grid(row=0, column=4)
    
root.mainloop()

I didn't encounter any problems. Indeed, the default radiobutton when no buttons are clicked, appears with a small grey dot. But when clicking on a radiobutton the default grey dots disappear.

CodePudding user response：

You need to initialize the StringVar with value other than empty string (default value if not specified) or the values for those radiobuttons, for example ' ':

letter_choice = StringVar(value=' ')