层 Python 数字总和

Question

this is my first question around here.

I've been working on an algorithm that adds the numbers entered until I get a single-digit number, but haven't been able to find a solution for about a week.

for example:

value = 1994

1. Step = 1+9+9+4 = 23
2. Step = 2+3 = 5

Answer 1

Try this:

def func(x):
    while x >= 10:
        x = sum([int(c) for c in str(x)])
    return x

print(func(1994))

Answer 2

value = 1994
while len(str(value)) != 1:
  value = sum([int(i) for i in str(value)])

print(value)

5

What's going on?

• initiate value
• loop if the length of the integer is not equal to one (meaning it's done)
• get a sum of the list of all sub ints inside the int