function that counts...

[Jerry Hill]

On Wed, May 19, 2010 at 3:58 PM, superpollo <utente at esempio.net> wrote:
> ... how many positive integers less than n have digits that sum up to m:
...
> any suggestion for pythonizin' it?

This is how I would do it:

def prttn(m, n):
    """How many positive integers less than n have digits that sum up to m"""
    total = 0
    for testval in range(n):
        sumofdigits = sum(int(char) for char in str(testval))
        if sumofdigits == m:
            total += 1
    return total

I added a docstring to the function, saying what it does, and what the
arguments are supposed to represent.  I also moved the
convert-to-string-and-sum-the-digits logic into a single generator
expression that's passed to the builtin sum function.  Oh, and I tried
to use slightly more expressive variable names.

-- 
Jerry