基于python的完全数之非TDD版本

#!/usr/bin/env python# -*- coding: utf-8 -*-# Filename: perfect_number.pyimport timefrom math import sqrt, floor'''' 创建一个完全数查找程序'' 完全数指其真因子相加等于数字本身的数字。' 例如，6 是一个完全数，因为 6 的因子（不包括 6 本身）是 1、2 和 3，' 而 1 + 2 + 3 = 6。' 更规则的完全数定义是因子（不包括该数字本身）之和等于该数字的数字。' 在我的示例中，计算结果是 1 + 2 + 3 + 6 - 6 = 6。''' def is_perfect(num):    sum = 1    for i in range(2, num):        if (num % i) == 0:             sum += i    return sum == numdef is_perfect2(num):    factors = []    sum = 1    for i in range(2, int(floor(sqrt(num))) + 1):        if (num % i) == 0:             factors.append(i)            if (num / i !=  i):                factors.append(num / i)    for f in factors:        sum += f    return sum == numdef is_perfect3(num):    sum = 1    for i in range(2, int(floor(sqrt(num))) + 1):        if (num % i) == 0:             sum += i            if (num / i !=  i):                sum += num / i    return sum == num# Test  PERFECT_NUMS = [6, 28, 496, 8128, 33550336]# 1def test_perfect(proc):    for num in PERFECT_NUMS:        assert(proc(num))# 2def test_non_perfect(proc):    for i in  range(2, 10000):        if PERFECT_NUMS.count(i) > 0:            assert(proc(i))        else:            assert(not proc(i))    assert(proc(PERFECT_NUMS[4]))'''start = time.time()test_perfect(is_perfect)test_non_perfect(is_perfect)print "is_perfect took %f secs" % (time.time() - start)'''start = time.time()test_perfect(is_perfect2)test_non_perfect(is_perfect2)print "is_perfect2 took %f secs" % (time.time() - start)start = time.time()test_perfect(is_perfect3)test_non_perfect(is_perfect3)print "is_perfect3 took %f secs" % (time.time() - start)