Setting values of Tkinter variables –

1. Using variable’s constructor
Syntax: 

var = Tkinter_variable(master, value = any_value)

2. Using set() method
Syntax: 

var = Tkinter_variable(master=None)
var.set(value)

3. Using setvar() method
Syntax: 

var = Tkinter_variable(master = None, name = "NAME")
master.setvar(name="NAME", value = any_value)

NOTE: When using this method name parameter is required (mandatory).

Tkinter supports some variables which are used to manipulate the values of Tkinter widgets. These variables work like normal variables. 
set() and get() methods are used to set and retrieve the values of these variables. 
The values of these variables can be set using set() method or by using constructor of these variables.
There are 4 tkinter variables. 
 

• BooleanVar()
• StringVar()
• IntVar()
• DoubleVar()