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第三题

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难阿难难难

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

from functools import reduce

def str2float(s): s1, s2 = s.split('.') def char2float(keys): return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,}[keys] def fn(x,y): return x 10 + y
return reduce(fn, map(char2float,s1 + s2 )) / 10 * len(s2)

print('str2float(\'123.456\') =', str2float('123.456'))

难阿难难难

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

怎么拷贝过来都会少了东西的。。。以下是正确的。。。

from functools import reduce

def str2float(s):
    s1, s2 = s.split('.')
    def char2float(keys):
        return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9,}[keys]
    def fn(x,y):
        return x * 10 + y        
    return reduce(fn, map(char2float,s1 + s2 )) / 10 ** len(s2)

print('str2float(\'123.456\') =', str2float('123.456'))

loveprruy

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

注意练习3,如果打印数字是整数或者b=0,你这个代码有问题

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