Got it..Thank you very much!

You forgot self in the parameter list: def add(self, a, b)

I can not see any output results only red and green lights are appeared. Is it happed to all or only me?

How do you follow someone? I can't search for users

If that's for some kata, I suggest you use that kata's Discourse to ask your question, read this

Here it's unrelated and hard to reply without context.

class Addition:
pass

def add(a, b):
    c = int(a) + int(b)
    return c

a = Addition()

print (a.add(5,6))

I am trying to run above code but getting error that
"add() takes 2 positional arguments but 3 were given"

Can someone please help where am I making mistake?