python基础练习——求“完数”

 #一个数如果恰好等于它的因子之和，这个数就称为“完数”。例如6=1＋2＋3.编程找出1000以内的所有完数

1 # -*- coding:utf-8 -*-
2
3 for i in range(2,1000):
4     l1 = []
5     for j in range(1,i):
6         if i%j==0:
7             l1.append(j)
8     num = sum(l1)
9     if num == i:
10         print "%d ="%i,
11         for i in range(len(l1)):
12             if i == len(l1)-1:
13                 print l1[i]
14             else:
15                 print "%d +"%l1[i],

运行结果为：6 = 1 + 2 + 3
28 = 1 + 2 + 4 + 7 + 14
496 = 1 + 2 + 4 + 8 + 16 + 31 + 62 + 124 + 248