def pi(N): # 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. odd_n = 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, ... result = map(lambda x: 4/x if x%4==1 else -4/x, odd_n) # step 4: 求和: return sum(result)
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Mc麦子_专炸潘多拉