What's the difference between a and b in these two python classes?

Question

What is the difference between these?
class A():
def __init__(self, a, b):
self.a = a
self.b = b

VS

class A():
a = 1
b = 1
def __init__(self, a, b):
self.a = a
self.b = b

Answer 1

In the first case, self.a and self.b are instance variables.
In the second case, a and b are class variables, and self.a and self.b are instance variable.

There is a huge difference between instance variable and class variable.

Answer 2

Nothing different we just have same extra properties in above one along with constructor