Event Python

# Button demonstration.
from Tkinter import *
from tkMessageBox import *
class PlainAndFancy( Frame ):
   def __init__( self ):
      Frame.__init__( self )
      self.pack( expand = YES, fill = BOTH )
      self.master.title( "Buttons" )
      self.plainButton = Button( self, text = "Plain Button", 
                                   command = self.pressedPlain )
      self.plainButton.bind( "", self.rolloverEnter )
      self.plainButton.bind( "", self.rolloverLeave )
      self.plainButton.pack( side = LEFT, padx = 5, pady = 5 )
   def pressedPlain( self ):
      showinfo( "Message", "You pressed: Plain Button" )
   def rolloverEnter( self, event ):
      event.widget.config( relief = GROOVE )
   def rolloverLeave( self, event ):
      event.widget.config( relief = RAISED )
def main():
   PlainAndFancy().mainloop()
if __name__ == "__main__":
   main()