python tkinter how to bind key to a button

You’ll need to make two changes:

1. Add

   master.bind('s', self.sharpen)
   

   to __init__. (Binding to the Frame, self, does not seem to work.)

2. When s is pressed, self.sharpen(event) will be called. Since
   Tkinter will be sending a Tkinter.Event object, we must also change the call
   signature to

   def sharpen(self, event=None):
   

   Thus, when the button is pressed, event will be set to the default
   value, None, but when the s key is pressed, event
   will be assigned to the Tkinter.Event object.