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四行完成第三题~

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天天向上ykyk

#1 Created at ... [Delete] [Delete and Lock User] 
def str2float(s):
    big, small = s.split(".")
    bignum = reduce(lambda x, y: 10*x+y, map(int, big))
    smallnum = 0.1 * reduce(lambda x, y: 0.1*x+y, map(int, small[::-1]))
    return bignum + smallnum

天天向上ykyk

#2 Created at ... [Delete] [Delete and Lock User]

big指整数部分，small指小数部分

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