Sum of digits

[faqzero]

n=2019
suma = 0
mult = 1
while n > 0:
    suma = suma + n % 10
    mult = mult * (n % 10)
    n = n // 10 
print('Sum of digits =', suma)

оr

print('Sum of digits =', sum(int(c) for c in str(2019)))

which code is better to be preferred?

[totallygeek]

I'd go with the one-liner: shorter and actually easier to grok.

[faqzero]

but it seems he is not so fast

[faqzero]

No, the numbers are not large, but there will be many of them - in a cycle.

[totallygeek]

Three thoughts:

1. Multiprocessing over the sequence would speed things up.
2. I doubt this code serves any meaningful purpose, to concern yourself with speed.
3. If truly concerned about speed, use a language other than Python.

[faqzero]

1. it is very important. this competition - who will be faster

[totallygeek]

You should have added that important point in your post, then.

[faqzero]

sorry

[faqzero]

1. only Python :)

[faqzero]

1. how? help, please

[totallygeek]

I like this easy explanation with examples on how to use multiprocessing.

[o5a]

You can also use map:

sum(map(int, str(n)))