new file

gui.py

from tkinter import *
import tkinter
from tkinter import ttk
import socket


def calculate(*args):
    try:
        str = (domain_name.get())
        ip_add = socket.gethostbyname(str)
        ip_addr.set(ip_add)
        ttk.Button(mainframe, text="process", command=calculate).grid(column=3, row=4, sticky=W)
    except socket.gaierror:
            ip_addr.set("Invalid Web address. Please Enter again!")
            ttk.Button(mainframe, text="retry", command=calculate).grid(column=3, row=4, sticky=W)

root = Tk()
root.title("smtp_telnet")

C = tkinter.Canvas(root, bg="blue", height=250, width=300)
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)

domain_name = StringVar()
ip_addr = StringVar()

domain_name_entry = ttk.Entry(mainframe, width=20, textvariable=domain_name)
domain_name_entry.grid(column=2, row=1, sticky=(W, E))

ttk.Label(mainframe, textvariable=ip_addr).grid(column=2, row=2, sticky=(W, E))
ttk.Button(mainframe, text="IP", command=calculate).grid(column=3, row=3, sticky=W)

ttk.Label(mainframe, text="Enter Domain name").grid(column=1, row=1, sticky=W)
ttk.Label(mainframe, text="IP address").grid(column=1, row=2, sticky=E)
ttk.Label(mainframe, text="").grid(column=3, row=2, sticky=W)

for child in mainframe.winfo_children(): child.grid_configure(padx=5, pady=5)

domain_name_entry.focus()
root.bind('<Return>', calculate)

root.mainloop()