def pi(N): ' 计算pi的值 ' # step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ... oddNumber = itertools.count(1,step=2) # step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1. subOnes = itertools.takewhile(lambda x:x<=2*N-1,oddNumber) # step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ... # step 4: 求和: sum = 0 dividend = 4.0 for n in subOnes: sum += dividend/n dividend = dividend * -1 return sum
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世代相传的锅盖头