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Python设置和检索Tkinter变量的值

本文概述

Tkinter支持一些变量, 这些变量用于操纵Tkinter小部件的值。这些变量像普通变量一样工作。

Set()和get()方法用于设置和检索这些变量的值。

这些变量的值可以使用

可以使用set()方法或使用这些变量的构造函数来设置这些变量的值。

有4个tkinter变量。

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

设置Tkinter变量的值–

1.使用变量的构造函数

语法如下:

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.使用set()方法

语法如下:

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.使用setvar()方法

语法如下:

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

NOTE: When uisng 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 )

检索tkinter变量的值–

1.使用get()方法

语法如下:

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.使用getvar()方法

语法如下:

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

NOTE: When uisng 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" ))

输出如下:

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

首先, 你的面试准备可通过以下方式增强你的数据结构概念:Python DS课程。


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