In the second code why the error is occurs?

Question

code is in the below link

https://code.sololearn.com/c9F9It3wRlc7/?ref=app

Answer 1

But MyClass it self is become an object while defining the MyClass then

why should you used"MyClass()" ?

Answer 2

This solution works:
class MyClass:
a = 10
@classmethod
def func(self):
return 'hello'