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补充详细讲解

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gd83594394

#1 Created at ... [Delete] [Delete and Lock User]

Python-进阶-itertools模块小结 http://www.wklken.me/posts/2013/08/20/python-extra-itertools.html#itertoolscountstart0-step1

gd83594394

#2 Created at ... [Delete] [Delete and Lock User]

交作业，顺便学习别人的思路

def pi(N):
    odds = itertools.count(1,2)
    o = itertools.takewhile(lambda x: x <= 2 * N - 1, odds)
    flag = 0
    s = 0
    for i in o:
        if flag == 0:
            s = s + 4 / i
            flag = 1
        else :
            s = s - 4 / i
            flag = 0            
    return s
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