Write a Python function to calculate the sum of digits of a number until the result becomes a single digit. For example, given the number 479, the sum of digits is 4 + 7 + 9 = 20, and then the sum of digits of 20 is 2 + 0 = 2.

Question

Accepted Answer

Python program to find the sum of digits till the result becomes a single digit.

Convert the number to a string and iterate through each digit.
Add the digits and store the result.
Repeat the process until the result becomes a single digit.
Return the single digit result.

Accepted Answer

x= int(input("please enter the no"))

while len(str(x))>1:

l=[]

for i in str(x):

l.append(int(i))

x=sum(l)

print(x)

Accepted Answer

static code

num = 123

digits = [int(digit) for digit in str(num)]

print(digits)

print(sum(digits))

dynamic code:

def digits_sum(num):

while num >= 10:

digits = [int(digit) for digit in str(num)]

num = sum(digits)

return num

Accepted Answer

def digital_root(num):

if num == 0:

return 0

else:

return 1 + ((num - 1) % 9)

Accepted Answer

result = digital_root(479)
print(result)  # Output: 6

Accepted Answer

def digital_root(num):
    while num >= 10:
        num = sum(int(digit) for digit in str(num))
    return num

Accepted Answer

def digital_root(num):
    while num >= 10:
        num = sum(int(digit) for digit in str(num))
    return num

Accepted Answer

def sum(value):

return (value - 1) % 9 + 1 if value > 0 else 0