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第三题

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longtometosee

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# 第三题，

from functools import reduce

def str2float(s):

    DIGITS={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9}

    def char2int(s): # s为key

        return DIGITS[s] # 生成value

    return reduce(lambda x,y:x*10+y,map(char2int,s[:s.index('.')]))+reduce(lambda x,y:x*10+y,map(char2int,s[s.index('.')+1:]))/(10**len(s[s.index('.')+1:]))

print(str2float('63377.3789876789876') )

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