如何将元素列表转换为其默认类型 [英] How to convert list of elements to their default types

问题描述

例如，我有列表:

old =  ['Savannah', '234Today', '4.5678', '23456','0.2342429']

如何将其转换为具有默认类型元素的列表

How can I convert it to a list with elements with the default type

收件人:

new =  ['Savannah', '234Today', 4.5678, 23456,0.2342429]

新列表将具有其默认类型的元素，即float，int，long

The new list will have the elements with their default type be it float, int, long

感谢任何帮助！谢谢

推荐答案

您可以使用ast.literal_eval和一些异常处理:

You can use ast.literal_eval and some exception handling:

>>> from ast import literal_eval
>>> lis = ['Savannah', '234Today', '4.5678', '23456','0.2342429']
def solve(x):
    try:
        return literal_eval(x)
    except (ValueError, SyntaxError):
        return x
...     
>>> map(solve, lis)
['Savannah', '234Today', 4.5678, 23456, 0.2342429]

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