Bind a function to a Button

[Amir Teymuri]

Why is the following code running into trouble? I want to bind the function callBack to the button, but i get:

TypeError: callBack() takes exactly 1 argument (2 given)

import pyo

import time

from kivy.app import App

from kivy.uix.button import Button

class MyApp(App):

        def __init__(self):

                super(MyApp, self).__init__()

                self.button = Button(text = "B",

                                     font_size = 50)

                self.button.bind(on_press = self.callBack)

        def callBack(self):

                print "call back called."

                

        def build(self):

                return self.button

if __name__ == "__main__":

        MyApp().run()

[Alexander Taylor]

The on_press event automatically passes an argument (the object instance) to the function that is called. Just make your callBack accept this (extra) argument and it will be fine.