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第三题

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小宝12216

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# -*- coding: utf-8 -*-
from functools import reduce

def str2float(s):
    def char2num(s):
        digits = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}
        return digits[s]
    s1,s2=s.split('.')
    s2=s2[::-1]
    s2=s2+'0'
    so1=reduce(lambda x,y:x*10+y, map(char2num,s1))
    so2=reduce(lambda x,y:x*0.1+y, map(char2num,s2))
    return so1+so2

print('str2float(\'123.456\') =', str2float('123.456'))
if abs(str2float('123.456') - 123.456) < 0.00001:
    print('测试成功!')
else:
    print('测试失败!')


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