def pi(N): l = itertools.takewhile(lambda x : x < 2*N,itertools.count(1,2)) p = 0 t = 4 for i in l: p += t/i t = -t return p
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雷锋20110
def pi(N): l = itertools.takewhile(lambda x : x < 2*N,itertools.count(1,2)) p = 0 t = 4 for i in l: p += t/i t = -t return p