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- """
- 找出1~9999之间的所有完美数
- 完美数是除自身外其他所有因子的和正好等于这个数本身的数
- 例如: 6 = 1 + 2 + 3, 28 = 1 + 2 + 4 + 7 + 14
- Version: 0.1
- Author: 骆昊
- Date: 2018-03-02
- """
- import time
- import math
- start = time.clock()
- for num in range(1, 10000):
- sum = 0
- for factor in range(1, int(math.sqrt(num)) + 1):
- if num % factor == 0:
- sum += factor
- if factor > 1 and num / factor != factor:
- sum += num / factor
- if sum == num:
- print(num)
- end = time.clock()
- print("执行时间:", (end - start), "秒")
- # 通过比较上面两种不同的解决方案的执行时间 意识到优化程序的重要性
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