text: #!/usr/bin/env python3
  # -*- config: utf-8 -*-
  
  from tkinter import *
  
  
  root = Tk()
  e1 = Entry(width=50)
  
  
  def insert():
      e1.insert(0, "Tkinter - GUI ")
  
  
  but = Button(text="Вставить", command=insert)
  e1.pack()
  but.pack()
  root.mainloop()
  