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°Destiny

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def pi(N):
    ' 计算pi的值 '
    # step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
    odd=itertools.count(1,2)
    # step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
    s=list(itertools.takewhile(lambda x: x < 2*N , odd))
    # step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
    l=[4/s[i] if i%2==0 else -4/s[i] for i in range(N)]
    # step 4: 求和:
    return sum(l)

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