python标准库之ast

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ast-Abstract Syntax Trees
用于帮助python应用处理抽象语法树
#　ast.literal_eval()将包含在字符串中的python结构转换为python结构，这些结构包含：strings, bytes, numbers, tuples, lists, dicts, sets, booleans, and None
In [33]: s = '[1, 2, 3]'

In [34]: lst = ast.literal_eval(s)

In [35]: lst
Out[35]: [1, 2, 3]

In [39]: s2 = "{'a': 1, 'b': 2}"

In [40]: s2
Out[40]: "{'a': 1, 'b': 2}"

In [41]: ast.literal_eval(s2)
Out[41]: {'a': 1, 'b': 2}