# Solution Exercise 200: double of an integer graphically with python tkinter

#### Exercise 200

Using the Tkinter Python library, write a Python program that displays a dialog box asking the user to enter an integer and return its double: #### Solution

``from tkinter import *# method that performs the actiondef action ():    # retrieve the value of the first input field    N = int (entryNumber1.get ())    N2 = 2 * N    # deletion of the existing value in the second field    entryNumber2.delete (0, END)    # inserting the new value N2 = 2 * N    entryNumber2.insert (0, N2)  # creation of the main windowfen = Tk ()fen.geometry ("430x200")# Creation of the first entry input field with the associated labellblnumber1 = Label (fen, text = "Enter the value of N")lblnumber1.place (x = 50, y = 20)entryNumber1 = Entry (fen)entryNumber1.place (x = 230, y = 20)# Creation of the 2nd entry input field with the associated labellblnumber2 = Label (fen, text = "Here is the double 2*N:")lblnumber2.place (x = 50, y = 50)entryNumber2 = Entry (fen)entryNumber2.place (x = 230, y = 50)# Creation of button that validates the actionValidate = Button (fen, text = "Validate", command = action)Validate.place (x = 230, y = 80, width = 165)                fen.mainloop ()``

Younes Derfoufi
my-courses.net