Python class eg

Question

Replace class body with expected behaviour

print('Hello world!')
class Stud:
pass

a = Stud()
print(a.rollNo) #1

b = Stud()
print(b.roll) #2

#and likewise for n students should print n
#replace class body such that for all students it returns correct roll no

Answer 1

Is this supposed to be a tutorial or example code? If so, it should be posted in the code tab for others to run and review.