why the answer is 1 ?

Question

class Animal:
i=0
def __init__(self,name):
self.name = name
Animal.i+=1
class Cat(Animal):
i=Animal.i
def __init__(self,name):
self.name = name
Cat.i +=1
sylvester = Cat('Sylvester')
print(Cat.i)

Answer 1

Because
Animal.i = 0
Cat.i = Animal.i

Then look what happens when a cat is made