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第三题

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#1 Created at ... [Delete] [Delete and Lock User] 
def str2float(s):    s1,s2 = s.split('.')    L1 = reduce(lambda x,y : x * 10 + y ,map(int,s1))    L2 = reduce(lambda x,y : x * 10 + y ,map(int,s2))    return L1 + L2 * 0.001
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