What's wrong with this code??

Question

Class Student:
mark1,mark2,mark3 = 45,50,55
def solv(self):
sum = Student.mark1 + Student.mark2 + Student.mark3
avg = sum/3
print("your marks = " , sum)
print("your avgerage =" , avg)
return
s = Student ()
S.solv()

Answer 1

#Compare with this corrected code :
# autocapitalization, identation mistakes

class Student:
mark1,mark2,mark3 = 45,50,55

def solv(self):
sum = Student.mark1 + Student.mark2 + Student.mark3

avg = sum/3
print("your marks = " , sum)
print("your avgerage =" , avg)

s = Student ()
s.solv()

Answer 2

Thanks