Tkinter radio buttons always gives values of 0

Question

I'm trying to use radio buttons to define a variable to be used in the rest of my script.

When I run this code, shift is always 0.

I have copied and pasted code from online doing something similar, but the values are always 0.

I am using Spyder to run python3.

Thanks.

from tkinter import *
root = Tk()

def pixelShift():
        shift = var.get()
        print(shift)

var = IntVar()

Radiobutton(root,
            text        = '1 Pixel',
            variable    = var,
            value       = 1,
            command     = pixelShift
            ).pack(anchor = W)

Radiobutton(root,
            text        = '10 Pixels',
            variable    = var,
            value       = 10,
            command     = pixelShift
            ).pack(anchor = W)

Radiobutton(root,
            text        = '100 Pixel',
            variable    = var,
            value       = 100,
            command     = pixelShift
            ).pack(anchor = W)

root.mainloop()

Answer 1

You are creating a new Tk() instance by using

var = IntVar()

You should use

root = Toplevel()

or

var = IntVar(root)