Project Euler Problem 20

Problem 20

n! means n × (n − 1) × ... × 3 × 2 × 1

For example, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.

Find the sum of the digits in the number 100!

# 求100！各位数之和。

from math import factorial as fac
string = str(fac(100))
sum1 = 0
for i in string:
    sum1 += int(i)
print('Sum:', sum1)

结果：648