Python | establecer y recuperar valores de la variable Tkinter

Tkinter admite algunas variables que se utilizan para manipular los valores de los widgets de Tkinter. Estas variables funcionan como variables normales. 
Los métodos set() y get() se utilizan para establecer y recuperar los valores de estas variables. 
Los valores de estas variables se pueden establecer usando el método set() o usando el constructor de estas variables.
Hay 4 variables tkinter. 
 

• Var booleana()
• VarString()
• IntVar()
• DobleVar()

Configuración de valores de variables Tkinter –

1. Usando
la sintaxis del constructor de variables: 

var = Tkinter_variable(master, value = any_value)

# importing tkinter module
from tkinter import *
 
# creating Tk() variable
# required by Tkinter classes
master = Tk()
 
# Tkinter variables
# initialization using constructor
intvar = IntVar(master, value = 25, name ="2")
strvar = StringVar(master, "Hello !")
boolvar = BooleanVar(master, True)
doublevar = DoubleVar(master, 10.25)

2. Usando el método set()
Sintaxis: 

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

# importing tkinter module
from tkinter import *
 
# creating Tk() variable
# required by Tkinter classes
master = Tk()
 
# Declaration of Tkinter variables
intvar = IntVar()
strvar = StringVar()
boolvar = BooleanVar()
doublevar = DoubleVar()
 
# Initialization of Tkinter variables
# using set() method
intvar.set(100)
strvar.set("GFG")
boolvar.set(False)
doublevar.set(10.36)

3. Usando el método setvar()
Sintaxis: 

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

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

# importing tkinter module
from tkinter import *
 
# creating Tk() variable
# required by Tkinter classes
master = Tk()
 
# Tkinter variables
# Giving user defined names to each variables
# so that variables can be modified easily
intvar = IntVar(master, name ="int")
strvar = StringVar(master, name ="str")
boolvar = BooleanVar(master, name ="bool")
doublevar = DoubleVar(master, name ="float")
 
# Setting values of variables
# using setvar() method
master.setvar(name ="int", value = 100)
master.setvar(name ="str", value ="GFG")
master.setvar(name ="bool", value = False)
master.setvar(name ="float", value = 1.236)

Recuperando valores de variables tkinter –

1. Usando el método get()
Sintaxis: 

tkinter_variable.get()

# importing tkinter module
from tkinter import *
 
# creating Tk() variable
# required by Tkinter classes
master = Tk()
 
# Tkinter variables
# Giving user defined names to each variables
# so that variables can be modified easily
intvar = IntVar(master, name ="int")
strvar = StringVar(master, name ="str")
boolvar = BooleanVar(master, name ="bool")
doublevar = DoubleVar(master, name ="float")
 
# Setting values of variables
# using setvar() method
master.setvar(name ="int", value = 100)
master.setvar(name ="str", value ="GFG")
master.setvar(name ="bool", value = False)
master.setvar(name ="float", value = 1.236)
 
# getting values of each variables using get() method
print("Value of IntVar()", intvar.get())
print("Value of StringVar()", strvar.get())
print("Value of BooleanVar()", boolvar.get())
print("Value of DoubleVar()", doublevar.get())

2. Usando el método getvar()
Sintaxis: 

var = Tkinter_variable(master, name = "NAME")
master.getvar(name = "NAME")

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

# importing tkinter module
from tkinter import *
 
# creating Tk() variable
# required by Tkinter classes
master = Tk()
 
# Tkinter variables
# Giving user defined names to each variables
# so that variables can be modified easily
intvar = IntVar(master, name ="int")
strvar = StringVar(master, name ="str")
boolvar = BooleanVar(master, name ="bool")
doublevar = DoubleVar(master, name ="float")
 
# Setting values of variables
# using setvar() method
master.setvar(name ="int", value = 100)
master.setvar(name ="str", value ="GFG")
master.setvar(name ="bool", value = False)
master.setvar(name ="float", value = 1.236)
 
# getting values of each variables using getvar() method
print("Value of IntVar()", master.getvar(name ="int"))
print("Value of StringVar()", master.getvar(name ="str"))
print("Value of BooleanVar()", master.getvar(name ="bool"))
print("Value of DoubleVar()", master.getvar(name ="float"))

Value of IntVar() 100
Value of StringVar() GFG
Value of BooleanVar() False
Value of DoubleVar() 1.236