def pi(N): natual = itertools.count(1, 2) s = itertools.takewhile(lambda x : x <=2N-1, natual) sum = 0 n = 1 for x in s: sum += pow(-1, n-1)4/x n = n + 1 return sum
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你明媚的笑好美
def pi(N): natual = itertools.count(1, 2) s = itertools.takewhile(lambda x : x <=2N-1, natual) sum = 0 n = 1 for x in s: sum += pow(-1, n-1)4/x n = n + 1 return sum