GUI TKINTER

Variable Classes

They are used to connect components like text entry widgets, radio buttons and so on to application variables.
This connection works both ways: if the variable changes, the components it's connected to will be updated and vice versa.
Variable classes
1. BooleanVar
2. DoubleVar
3. IntVar
4. StringVar

Creating Variable Class Objects:
Syntax:

var-name=variableClass()

Methods
get()	The get method returns the current value of the variable.
Srt(value)	The set method updates the variable.

#Write a program to exchange data from 2 textboxes.

from tkinter import *
class MyWin(Tk):
  def __init__(self):
    super().__init__()
    self.geometry("300x200")
    self.a=StringVar()
    self.b=StringVar()
    self.t1=Entry(self,textvariable=self.a)
    self.t1.pack()
    self.btn=Button(self,text="Exchange",command=self.exg)
    self.btn.pack()
    self.t2=Entry(self,textvariable=self.b)
    self.t2.pack()
  def exg(self):
    s1=self.a.get()
    s2=self.b.get()
    self.a.set(s2)
    self.b.set(s1)
win=MyWin()
win.mainloop()

#Write a program to increment a value from textbox.

from tkinter import *
class MyWin(Tk):
  def __init__(self):
    super().__init__()
    self.geometry("300x200")
    self.a=IntVar()
    self.t1=Entry(self,textvariable=self.a)
    self.t1.pack()
    self.btn=Button(self,text="Increment",command=self.incr)
    self.btn.pack()
  def incr(self):
    n=self.a.get()
    n=n+1
    self.a.set(n)
win=MyWin()
win.mainloop()

#Write a program to calculate factorial of number.

from tkinter import *
from tkinter.messagebox import *
class MyWin(Tk):
  def __init__(self):
    super().__init__()
    self.geometry("300x200")
    self.a=IntVar()
    self.t1=Entry(self,textvariable=self.a,width=3)
    self.t1.pack()
    self.btn=Button(self,text="Factorial",command=self.calfact)
    self.btn.pack() 
  def calfact(self):
    n=self.a.get()
    f=1
    for i in range(1,n+1):
      f=f*i
    showinfo(message="Factorial of "+str(n)+" is "+str(f))
win=MyWin()
win.mainloop()

CCITcoder

Introduction to Python

Conditional statements

Iterative statements

Functions

OOPs

Collection

Module and Exception

DateBase

Inherintance

GUI