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第三问

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ChaselZ0429

#1 Created at ... [Delete] [Delete and Lock User] 
def str2float(s):    m,n=s.split('.')    def tra(st):        return int(st)    return reduce(lambda x,y:x*10+y,map(tra,m))+reduce(lambda x,y:x*0.1+y,map(tra,n[::-1]))*0.1

ChaselZ0429

#2 Created at ... [Delete] [Delete and Lock User] 
def str2float(s):
    m,n=s.split('.')
    def tra(st):
        return int(st)
    return reduce(lambda x,y:x*10+y,map(tra,m))+reduce(lambda x,y:x*0.1+y,map(tra,n[::-1]))*0.1

ChaselZ0429

#3 Created at ... [Delete] [Delete and Lock User] 
def str2float(s):

    m,n=s.split('.')

    tra=lambda x:int(x)

    return reduce(lambda x,y:x*10+y,map(tra,m))+reduce(lambda x,y:x*0.1+y,map(tra,n[::-1]))*0.1
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