sum([4/(2*x-1)*(-1)**(x-1) for x in itertools.takewhile(lambda x: x <= 100, itertools.count(1))])
其实itertools.takewhile(lambda x: x <= 100, itertools.count(1))生成的序列和range(1, 101)没啥区别
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采蘑菇的lucas_688
其实itertools.takewhile(lambda x: x <= 100, itertools.count(1))生成的序列和range(1, 101)没啥区别