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题目：有一分数序列：2/1，3/2，5/3，8/5，13/8，21/13...求出这个数列的前20项之和。 程序分析：请抓住分子与分母的变化规律。 程序源代码： 方法一：- #!/usr/bin/python
- # -*- coding: UTF-8 -*-
-
- a = 2.0
- b = 1.0
- s = 0
- for n in range(1,21):
- s += a / b
- t = a
- a = a + b
- b = t
- print (s)
- #!/usr/bin/python
- # -*- coding: UTF-8 -*-
-
- a = 2.0
- b = 1.0
- s = 0.0
- for n in range(1,21):
- s += a / b
- b,a = a , a + b
- print (s)
-
- s = 0.0
- for n in range(1,21):
- s += a / b
- b,a = a , a + b
- print (s)
- #!/usr/bin/python
- # -*- coding: UTF-8 -*-
-
- a = 2.0
- b = 1.0
- l = []
- l.append(a / b)
- for n in range(1,20):
- b,a = a,a + b
- l.append(a / b)
- print reduce(lambda x,y: x + y,l)
- #!/usr/bin/python
-
- from functools import reduce
-
- a = 2.0
- b = 1.0
- l = []
- l.append(a / b)
- for n in range(1,20):
- b,a = a,a + b
- l.append(a / b)
- print (reduce(lambda x,y: x + y,l))
以上实例输出结果为：
32.6602607986
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