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第三题

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#1 Created at ... [Delete] [Delete and Lock User] 
def str2float(s):
    def multi(x, y):
        return x * 10 + y

    L1, L2 = s.split('.')
    return reduce(multi, map(int, L1)) + reduce(multi, map(int, L2)) * pow(0.1, len(L2))
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