title: Constantly Update Label Widgets From Entry Widgets TKinter
body: <p>I am trying to make a form using TKinter that takes information from a/multiple entry widget(s) and uses them as the value for text widgets.  For example, this could work:</p>
  
  <pre><code>import Tkinter
  from Tkinter import *
  top = Tk()
  
  
  e1 = Entry(top)
  e2 = Entry(top)
  t = Label(top, text = e1.get() + e2.get())
  e1.pack()
  e2.pack()
  t.pack()
  
  top.mainloop()
  </code></pre>
  
  <p>The issue is that this does not automatically update itself.  I know it could be done using a button, but I would like to have the information calculated/updated in the Label widget as the user types into the Entry widgets.  What would be the best was to do this? The following implementation of a while loop does not work as the program enters the top.mainloop() and does not exit:</p>
  
  <pre><code>import Tkinter
  from Tkinter import *
  top = Tk()
  
  
  e1 = Entry(top)
  e2 = Entry(top)
  t = Label(top, text = e1.get() + e2.get())
  e1.pack()
  e2.pack()
  
  while True:
  
      t = Label(top, text = e1.get() + e2.get())
      t.pack()
      top.mainloop()
  </code></pre>
  
  <p>Thank you in advance.
  Six</p>