python - 将数组转换为字符串格式 - Python

Question

我正在通过套接字接收字符串，如下所示

"['[0,0,0]','[0,0,0]']"

我想将其转换回数组。我尝试过使用

received.split(",")

但是它会拆分数组内部的数组。

如何将字符串转换为数组？

Answer 1

>>> import ast
>>> s = "['[0,0,0]','[0,0,0]']"
>>> s = ast.literal_eval(s)
>>> s
['[0,0,0]', '[0,0,0]']
>>> s = [ast.literal_eval(sub) for sub in s]
>>> s
[[0, 0, 0], [0, 0, 0]] 

使用literal_eval比eval更安全。来自文档:

31.2. ast — Abstract Syntax Trees¶

ast.literal_eval(node_or_string)

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.