[pygtk] widget vs. entry

[Christopher Spears]

In the PyGTK tutorial, I came across this function:

def enter_callback(self, widget, entry):
    entry_text = entry.get_text()
    print "Entry contents: %s\n" % entry_text

This function prints text that was entered into an
entry.  I'm confused by the parameters.  Isn't the
entry also the widget?  The webpage I am referring to
is:

http://www.pygtk.org/pygtk2tutorial/sec-TextEntries.html