Python | setting and retrieving values of Tkinter variable

16 Aug, 2021
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()
1. Using variable’s constructorSyntax: 
var = Tkinter_variable(master, value = any_value)
Python3
# importing tkinter modulefrom tkinter import * # creating Tk() variable# required by Tkinter classesmaster = Tk() # Tkinter variables# initialization using constructorintvar = IntVar(master, value = 25, name ="2")strvar = StringVar(master, "Hello !")boolvar = BooleanVar(master, True)doublevar = DoubleVar(master, 10.25)
2. Using set() methodSyntax: 
var = Tkinter_variable(master=None)
var.set(value)
Python3
# importing tkinter modulefrom tkinter import * # creating Tk() variable# required by Tkinter classesmaster = Tk() # Declaration of Tkinter variablesintvar = IntVar()strvar = StringVar()boolvar = BooleanVar()doublevar = DoubleVar() # Initialization of Tkinter variables# using set() methodintvar.set(100)strvar.set("GFG")boolvar.set(False)doublevar.set(10.36)
3. Using setvar() methodSyntax: 
var = Tkinter_variable(master = None, name = "NAME")
master.setvar(name="NAME", value = any_value)

NOTE: When using this method name parameter is required (mandatory).
Python3
# importing tkinter modulefrom tkinter import * # creating Tk() variable# required by Tkinter classesmaster = Tk() # Tkinter variables# Giving user defined names to each variables# so that variables can be modified easilyintvar = 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() methodmaster.setvar(name ="int", value = 100)master.setvar(name ="str", value ="GFG")master.setvar(name ="bool", value = False)master.setvar(name ="float", value = 1.236)
1. Using get() methodSyntax: 
tkinter_variable.get()
Python3
# importing tkinter modulefrom tkinter import * # creating Tk() variable# required by Tkinter classesmaster = Tk() # Tkinter variables# Giving user defined names to each variables# so that variables can be modified easilyintvar = 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() methodmaster.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() methodprint("Value of IntVar()", intvar.get())print("Value of StringVar()", strvar.get())print("Value of BooleanVar()", boolvar.get())print("Value of DoubleVar()", doublevar.get())
2. Using getvar() methodSyntax: 
var = Tkinter_variable(master, name = "NAME")
master.getvar(name = "NAME")

NOTE: When using this method name parameter is required (mandatory).
Python3
# importing tkinter modulefrom tkinter import * # creating Tk() variable# required by Tkinter classesmaster = Tk() # Tkinter variables# Giving user defined names to each variables# so that variables can be modified easilyintvar = 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() methodmaster.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() methodprint("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
 
sumitgumber28
Python-tkinter
Python
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