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第三题

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def str2float(s):
    dic = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}
    sList = s.split('.')
    return reduce(lambda x,y:x*10+y,map(lambda x:dic[x],sList[0])) + reduce(lambda x,y:x*10+y,map(lambda x:dic[x],sList[1]))/1000
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