Can't bind a function to a button

Question

I can't seem to bind my function to this certain button. I have tried this:

This is my function:

def callback(str):
    print('he button <%s> is being pressed' % str)

and this is where i bind the function:

btn = Button(text="%s" % feedList[i]['message'])
btn.bind(on_press=callback(i))

Answer 1

You should pass function name when binding:

btn.bind(on_press=callback)

# ...

def callback(instance, value):
    print('My button <%s> state is <%s>' % (instance, value))

---

If you want to pass i to callback also you can use partial function:

from functools import partial

btn.bind(on_press=partial(callback, i))

# ...

def callback(i, instance, value):
    print('My button <%s> state is <%s>' % (instance, value))