title: How can the response of a Button go to an Entry in Tkinter
body: <p>I'm trying to generate the output of each Button click to an Entry, each time I press generate button the output shows up in the console, but I want it to show in the GUI so I tried to add the command <code>command=gen</code> to the Entry and it gives me an error, it seems like Entry's don't accept the argument command, but I'm not too sure if it's just a syntax error, is there another way of displaying the output of the Button click on the Gui? The reason why I wanted it to be an Entry is because it provides a perfect rectangular shape with white inside the box which is perfect for generating things.</p>
  
  <pre><code>from Tkinter import * 
  
  def gen():
      print ("testetstesttesttest")
  
  window = Tk()
  window.geometry("500x300")
  window.title("TestGUI")
  botton = Button(window, text="Generate ids",command=gen).place(x=210,y=160)
  textbox = Entry(window, command=gen).place(x=210,y=100)
  window.mainloop()
  </code></pre>
  
  <p>The error I receive:</p>
  
  <pre><code>(widgetName, self._w) + extra + self._options(cnf))
  _tkinter.TclError: unknown option "-command"
  </code></pre>