Hardcore stuck at python 27.2 summing digits

Question

Hello guys i am hardcore stuck at this code cant figure it out its the 6th day i cant find any solution pls help

n = int(input())

length = 0

while n > 0:
n //= 10
length += 1

print(length)

Answer 1

If you want to calculate the sum of digits using math, look at the modulus operator.

For example, here:

n = int(input())
length = 0
digit_sum = 0

while n > 0:
digit_sum += n % 10 # add value of least significant base 10 digit.
n //= 10
length += 1 # not really needed unless you also want to count the number of digits.

print(digit_sum)

Here is another way to calculate it. It uses list comprehension and Python's sum function:
digit_sum = sum([int(digit) for digit in str(n)])

print(digit_sum)

Answer 2

You can do it that way too:
def getSum(n):
sum = 0
while (n != 0):
sum = sum + (n % 10)
n = n//10
return sum

n = int(input())
print(getSum(n))