Why do Tkinter's Radio Buttons all Start Selected When Using StringVar but not IntVar?

Why do Tkinter's Radio Buttons all Start Selected When Using StringVar but not IntVar?

python python-3.x tkinter radio-button tk

tkinter

Give a radio button a default value in tkinter python

python-3.x tkinter radio-button default-value

tkinter

How can I move the text label of a radiobutton below the button in Python Tkinter?

python tkinter radio-button

tkinter

How to select only one Radiobutton in tkinter

python tkinter radio-button

tkinter

Radio button values in Python Tkinter

python tkinter radio-button

tkinter

Python - arrays of tkinter widgets changing with radiobutton clicks

python arrays user-interface tkinter radio-button

tkinter

How to add radiobuttons to a submenu in Tkinter

python tkinter radio-button submenu menubar

tkinter

Launch command in Tkinter based on selected radio button?

python command radio-button tkinter

tkinter

Python Tkinter Radiobutton variable output

python variables tkinter radio-button

tkinter

Tkinter: All radio buttons are already selected

python user-interface tkinter radio-button

tkinter

Radiobutton modifying increment values in spinbox Python

python python-2.7 tkinter radio-button increment

tkinter

Radiobutton not working properly in python

python tkinter radio-button

tkinter

RadioButton Error using Tkinter

python user-interface tkinter radio-button

tkinter

Event triggered by Listbox and Radiobutton in Tkinter

python listbox tkinter radio-button eventhandler

tkinter

Tkinter changing entry state based on radiobutton

python python-3.x tkinter radio-button tkinter-entry

tkinter