title: Edit contents of new Toplevel window
body: <p>I am trying to understand the Toplevel widget in Tkinter. I want to create a window with a button which opens a new window with contents in it upon clicking.</p>
  
  <p>I have this, which opens a new windown fine, but I don't know how to edit the contents of that new window.</p>
  
  <pre><code>from Tkinter import *
  
  master = Tk()
  C = Canvas(master, width=200, height=100)
  C.pack()
  
  def Open():
      top = Toplevel()
  
  b = Button(master, text="Open New Window", command=Open)
  b.pack()
  
  mainloop()
  </code></pre>
  
  <p>For convenience, let's just say I wanted that new window to contain some text, eg: "Hello World!"</p>