Ответ:

from tkinter import *

from tkinter import messagebox

def display_full_name():

   messagebox.showinfo("Програмаn", name.get() + " " + surname.get())

root = Tk()

root.title("Програма")

name = StringVar()

surname = StringVar()

name_label = Label(text="Введите имя:")

surname_label = Label(text="Введите фамилию:")

name_label.grid(row=0, column=0, sticky="w")

surname_label.grid(row=1, column=0, sticky="w")

name_entry = Entry(textvariable=name)

surname_entry = Entry(textvariable=surname)

name_entry.grid(row=0,column=1, padx=5, pady=5)

surname_entry.grid(row=1,column=1, padx=5, pady=5)

message_button = Button(text="Click Me", command=display_full_name)

message_button.grid(row=2,column=1, padx=5, pady=5, sticky="e")

root.mainloop()

Объяснение: