Example GUI

from tkinter import *
import tkinter.messagebox

def fx():
    global Input
    result = ""
    n = int(Value.get())
    try:
        for i in range(1,11): # Changed Xrange to range
            result += "{} x {} = {}\n".format(i,n,i*n)
    except NameError:
        tkinter.messagebox.showerror("What Happened?", "Something went wrong!")
    return print(result), tkinter.messagebox.showinfo("Result", result)



App = Tk()
App.title("Your Program!")
App.geometry("400x100+200+200")
App.config(bg="#404040")

Instruction = Label(App, text = "Enter an Integer: ", bg="#404040", fg="white")
Instruction.pack(side=TOP)

Input = IntVar(None)
Value = Entry(App, textvariable = Input, fg="white",bg="#202020")
Value.pack()

Run = Button(App, bg="#202020",width = 20, text = " Do work",fg="white",command = fx)
Run.pack(side=BOTTOM)

App.mainloop()