列表值中的python数字格式

Question

这是列表

 value = {'a': [['1312.98680732', 14.28625384], 
                ['1312.98680735', 20.303], 
                ['1312.98680736', 9.78438636]], 
          'b': [['1307.00000001', 0.02968967], 
                ['1307.00000000', 1.948], 
                ['1306.53301802', 0.02]], 
          'c': 0, 
          'd': 226843654} 

我能够提取并得到

a = [['1312.98680732', 14.28625384], 
     ['1312.98680735', 20.303], 
     ['1312.98680736', 9.78438636]]

但是我需要将引用的值从字符串转换为 float 。

期望的输出:

a = [[1312.98680732, 14.28625384], 
     [1312.98680735, 20.303], 
     [1312.98680736, 9.78438636]]

我尝试了 list(map(float, a) 但只有当我有一个值时它才有效。

Answer 1

对于嵌套数据，使用嵌套 list comprehension :

>>> a = [['1312.98680732', 14.28625384], ['1312.98680735', 20.303], ['1312.98680736', 9.78438636]]
>>> [[float(x) for x in group] for group in a]
[[1312.98680732, 14.28625384], [1312.98680735, 20.303], [1312.98680736, 9.78438636]]