A simple program to ask the user to give two numbers and then the program will compute the sum of two numbers using a graphical user interface using Python programming language.

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Program Listing

from tkinter import *

root = Tk()
root.title("Addition of Two Numbers Using GUI in Python")
width = 600
height = 300
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()
x = (screen_width/2) - (width/2)
y = (screen_height/2) - (height/2)
root.geometry("%dx%d+%d+%d" % (width, height, x, y))

def add():
    if not num1.get() and not num2.get():
        print("Please enter a number")
        lbl_text.config(text = "The answer is %d" % (res))

Top = Frame(root, bd=2,  relief=RIDGE)
Top.pack(side=TOP, fill=X)
Form = Frame(root, height=200)
Form.pack(side=TOP, pady=20)

lbl_title = Label(Top, text = "Addition of Two Numbers Using GUI in Python", font=('arial', 16))
lbl_num1 = Label(Form, text = "Enter First Value:", font=('arial', 14), bd=15)
lbl_num1.grid(row=0, sticky="e")
lbl_num2 = Label(Form, text = "Enter Second Value:", font=('arial', 14), bd=15)
lbl_num2.grid(row=1, sticky="e")
lbl_text = Label(Form)
lbl_text.grid(row=2, columnspan=2)

#==============================ENTRY WIDGETS==================================
num1 = Entry(Form, font=(14))
num1.grid(row=0, column=1)
num2 = Entry(Form, font=(14))
num2.grid(row=1, column=1)

#==============================BUTTON WIDGETS=================================
btn_calculate = Button(Form, text="Add", width=45, command=add)
btn_calculate.grid(pady=25, row=3, columnspan=2)