title: Entrybox input copied into another entrybox and still be able to edit input independently
body: <p>Im trying to gather the input from one entrybox and then putting it into another entrybox. I can do this using a Stringvar but i want to 
  be able to edit the second entry without changing the other.</p>
  
  <pre><code>from tkinter import *
  
  my_window = Tk()
  
  var_ip = StringVar()
  var_mask = StringVar()
  var_gateway = StringVar()
  
  
  def user_input_ip():
      input_ip = entry_ip.get()
      display_ip = input_ip
      var_ip.set(display_ip)
  
  
  entry_ip = Entry(my_window, font="Helvetica 15", textvariable=var_ip)
  entry_ip.place(x=35, y=100, width=158, height=30)
  entry_ip.bind("&lt;Tab&gt;", focus_next_widget)
  entry_ip.bind("&lt;Return&gt;", enter_key)
  
  
  def user_input_mask():
      input_mask = entry_mask.get()
      display_mask = input_mask
      var_mask.set(display_mask)
  
  
  entry_mask = Entry(my_window, font="Helvetica 15", textvariable=var_mask)
  entry_mask.place(x=35, y=165, width=158, height=30)
  entry_mask.bind("&lt;Tab&gt;", focus_next_widget)
  entry_mask.insert(END, "255.255.255.255")
  
  
  def user_input_gateway():
      input_gateway = entry_gateway.get()
      display_gateway = input_gateway
      var_gateway.set(display_gateway)
  
  
  entry_gateway = Entry(my_window, font="Helvetica 15", textvariable=var_gateway)
  entry_gateway.place(x=35, y=230, width=158, height=30)
  entry_gateway.bind("&lt;Tab&gt;", focus_next_widget)
  
  my_window.mainloop()
  </code></pre>