title: getting the label value of a button in Gtk
body: <p>Am learning Gtk. I wanted to build a calculator, in which i want to display the number pressed , in the textbox. I have completed it, by calling different functions for different buttons clicked, and appending the value in the textbox with the value of the button pressed. Using python 2.7.3 </p>
  
  <p>Is there a way to obtain the label value of the button pressed so that i can use a single function instead of 10 functions from 0 to 9?</p>
  
  <p>Thanks in advance </p>