from Tkinter import *

class Question:

    def __init__(self, master):
        self.button = Button(master,
                             bitmap='question',
                             command=self.action)
        self.button.pack()

    def action(self):
        # Toggle image
        if self.button['bitmap'] == 'question':
            self.button.config(bitmap='questhead')
        else:
            self.button.config(bitmap='question')