新手python问题Write a function called digit_sumthat takes a posi

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新手python问题
Write a function called digit_sumthat takes a positive integer n as input and returns the sum of all that number's digits.
For example:digit_sum(1234)should return 10 which is 1 + 2 + 3 + 4.
(Assume that the number you are given will always be positive.)
这个要怎么写啊,新手不会做了,来求教.

不知道你给的数据是10进还是16进的,两个都写一下好了def digit_sum_16( number ):
    con = 0
    while number:
        con += number & 0xF
        number >>= 4
    return con

def digit_sum_10( number ):
    con = 0
    while number:
        con += number % 10
        number /= 10
    return con
再问：

是codecademy上面的题目，图片是题目描述。谢谢了。
再答：应该是10进制的
再问：提交以后对了，能给我讲解一下吗。新人不是很懂...
再答：很简单啊,10进制就是余数相加而已

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