[Tutor] newbie looking for code suggestions

[Bob Roher]

> #This function will take an integer as input and return the sum of
> #its digits.
> def sum_of_digits(in_string):
>     sum = 0
>     t = 0
>     for n in in_string:
>         t = int(n)
>         sum = sum + t
>     return sum
>

def sum_of_digits(in_string):
    return reduce(lambda x,y: int(x) + int(y), in_string)

is another approach.
Here's another without the lambda:

def sum_of_digits(in_string):
    import operator
    return reduce(operator.add, map(int, in_string))

What this does is call 'map(int, in_string)' which call the function 'int'
on
each char in the string and put it in a new list:

>>> s = '1024'
>>> map(int, s)
[1, 0, 2, 4]

reduce then walks this new list and calls operator.add on it.


Thanks for the intro to reduce, lamda, and map.  I did a little reading on
 those today, but it will take me a while to fully understand them.  I want
to
do some testing to see which function will execute the fastest when I get
time.