class Student:
    roll_no = None
    name = None

s0 = Student()

s0.roll_no = 0
s0.name = 'Bhuvanesh'

print(s0.roll_no, s0.name)

s1 = Student()
print(s1.roll_no, s1.name)

s2 = Student()
s2.roll_no = 2
s2.name = 'Harish'
print(s2.roll_no, s2.name)

s50 = Student()
s50.name = 'Asmita'
print(s50.roll_no, s50.name)


