"""
 Find the sum of all multiples of 3 or 5 below 1000

 Jim M | in class Oct 6 | GPL
"""

### This whole file is really just this ...
### but with a clearer division into functions and tests.
#total = 0
#for i in range(n):
#    if i % 5 == 0 or i % 3 == 0
#        total = total + i
#print total

def multiple_of(i, n):
    """Return True if i is a multiple of n
       >>> multiple_of(10, 3)
       False
       >>> multiple_of(12, 3)
       True
    """
    return i % n == 0

def sum_multiples(n):
    """Return sum of numbers that are a multiple of 3 or 5 up to n
       >>> sum_multiples(10) # 3 + 5 + 6 + 9 = 23
       23
    """
    total = 0
    for i in range(n):
        if multiple_of(i, 5) or multiple_of(i, 3):
            total = total + i
    return total

def main():
    print sum_multiples(1000)

if __name__ == "__main__":
    import doctest
    doctest.testmod()
    main()