#!/usr/bin/env python
# coding:UTF-8
"""
@version: python3.x
@author:曹新健
@contact: [email protected]
@software: PyCharm
@file: 1223.py
@time: 2018/12/23 20:56
"""
'''
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。
'''
"""
#方法一
def g(n):
if n <= 2:
return n
else:
return g(n-1) + g(n-2)
sum = 0
for i in range(1,21):
sum += g(i+1)/g(i)
print(sum)
"""
#方法二
numerator = 2
denominator = 1
sum = 0
while True:
try:
n = int(input("请输入一个整数:"))
except ValueError:
print("输入错误,请输入整数")
else:
for i in range(n):
sum += numerator / denominator
numerator, denominator = numerator + denominator, numerator
print(sum)
break
Python:分数序列求和
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转载自blog.csdn.net/caoxinjian423/article/details/85370372
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