python - 将列表的字符串表示形式转换为实际的列表对象

Question

这个问题在这里已经有了答案:

How to convert string representation of list to a list (19 个回答)

关闭 6年前.

我有一个看起来与列表相同的字符串，比如说:

fruits = "['apple', 'orange', 'banana']"

将其转换为列表对象的方法是什么？

Answer 1

>>> fruits = "['apple', 'orange', 'banana']"
>>> import ast
>>> fruits = ast.literal_eval(fruits)
>>> fruits
['apple', 'orange', 'banana']
>>> fruits[1]
'orange'

正如评论中指出的 ast.literal_eval 安全。来自文档:

Safely evaluate an expression node or a string containing a Python expression. The string or node provided may only consist of the following Python literal structures: strings, numbers, tuples, lists, dicts, booleans, and None.

This can be used for safely evaluating strings containing Python expressions from untrusted sources without the need to parse the values oneself.