[Tutor] Converting integers into digit sum (Python 3.3.0)

[Asokan Pichai]

On Tue, Dec 10, 2013 at 4:06 PM, Asokan Pichai <pasokan at talentsprint.com>wrote:

>
>
>
> On Tue, Dec 10, 2013 at 3:09 PM, Rafael Knuth <rafael.knuth at gmail.com>wrote:
>
>> Hej there,
>>
>> > I don't know if everyone would consider this more elegant but it's
>> > certainly shorter:
>>
>> Thanks!
>>
>> >>>> def DigitSum(YourNumber):
>> > ...     return sum(map(int, YourNumber))
>> > ...
>> >>>> DigitSum('55')
>> > 10
>>
>> I don't understand yet what the "map" function does - can you explain?
>> I read the Python 3.3.0 documentation on that topic but I frankly
>> didn't really understand it
>> http://docs.python.org/3/library/functions.html#map. My search for
>> simple code examples using "map" wasn't really fruitful either.
>>
>> Other than that, I went through each of the 7 alternatives to my
>> "Integer to Digit Sum" program you guys sent me, I understand what
>> each of those programs does. My favorite one is:
>>
>> def DigSum (integer):
>>     s = 0
>>     while integer != 0:
>>         integer, remainder = divmod(integer, 10)
>>         s += remainder
>>     print(s)
>>
>> DigSum(537)
>>
>> It's really a beautiful, elegant solution IMHO and way better than my
>> original code (convert int to string, store each digit in an empty
>> list, then convert them back to int and sum them).
>>
>> If you liked it, I will give you one that uses one less variable :-)
>
> def digitSum(n):
>       dsum = 0
>       while n > 0:
>             dsum += n % 10
>             n /= 10
>       return dsum
>
>
>> Again, thank you all!
>>
> You are welcome.
>
>
> Asokan Pichai
>
> "So, if I look into my foggy crystal ball at the future of computing
> science education, I overwhelmingly see the depressing picture of "Business
> as usual". The universities will continue to lack the courage to teach hard
> science, they will continue to misguide the students, and each next stage
> of infantilization of the curriculum will be hailed as educational
> progress."
>
> Edsger W Dijkstra in Dec 1988, in an article titled "on the cruelty of
> really teaching Computer Science" Link:
> http://www.cs.utexas.edu/~EWD/transcriptions/EWD10xx/EWD1036.html
>

Stupid of me not to have mentioned that this Python 2.x only. Sorry
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