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Bind key action to button

from Tkinter  import * class MyApp:   def __init__(self, parent):     self.myParent = parent        self.myContainer1 = Frame(parent)     self.myContainer1.pack()          self.button1 = Button(self.myContainer1, command=self.button1Click)       self.button1.bind("<Return>", self.button1Click_a)        self.button1.configure(text="OK", background= "green")     self.button1.pack(side=LEFT)     self.button1.focus_force()                 self.button2 = Button(self.myContainer1, command=self.button2Click)        self.button2.bind("<Return>", self.button2Click_a)        self.button2.configure(text="Cancel", background="red")          self.button2.pack(side=RIGHT)        def button1Click(self):      print "button1Click event handler"      if self.button1["background"] == "green":         self.button1["background"] = "yellow"     else:       self.button1["background"] = "green"      def button2Click(self):     print "button2Click event handler"      self.myParent.destroy()            def button1Click_a(self, event):      print "button1Click_a event handler (a wrapper)"      self.button1Click()            def button2Click_a(self, event):      print "button2Click_a event handler (a wrapper)"      self.button2Click()                         root = Tk() myapp = MyApp(root) root.mainloop()