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第三题（没用到map）

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邱成成儿

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

思考： 首先得到小数点位于倒数第几位，并使n等于10的负相应次方，最后用转换出的整型数值乘n，获得答案。

from functools import reduce
def char2float(s):
    n=10**-(s[::-1].index('.'))
    return(n*reduce(lambda x,y:x*10+y,[int(a) for a in s if a is not '.']))

邱成成儿

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

更简一步：

from functools import reduce
def char2float(s):
    return((10**-s[::-1].index('.'))*reduce(lambda x,y:x*10+y,[int(a) for a in s if a is not '.']))
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