网上一个专门用来给新手练算法的：
http://projecteuler.net/problem=1
Multiples of 3 and 5
Problem 1
Published on Friday, 5th October 2001, 06:00 pm; Solved by 368828If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.
sum = 0; for number in range(1,1000): if (number % 3 == 0) or (number % 5 == 0): sum += number print 'The sum is:', sum, 'The current number is', number
