from Tkinter import *

def hello(event):
    print "hello"
    
def bye(event):
    print "Bye"
    
    
root= Tk()

widget =Button(root,text='hello widget')
widget.pack(expand=YES, fill=BOTH,side =LEFT)
widget.bind('<Button-1>',hello)
widget.bind('<Double-1>',bye)
root.mainloop()