将看起来像列表的字符串转换为真正的列表 - python [英] Converting string that looks like a list into a real list - python

问题描述

我的输入文件的行如下所示:

My input files have lines that looks like this:

[(0, 1), (1, 3), (2, 1), (3, 1), (4, 1)]
[(0, 1, 6), (1, 3,7), (3, 1,4), (3, 1,3), (8, 1,2)]
[1,2,3,5,3]

没有字母，没有小数，只有整数和元组中的元素个数一致.

There are no letters, no decimals, only integers and number of element in tuples will be consistent.

如何将它们变成真正的元组列表/int 列表?

How do i make them into real list of tuples / list of int?

推荐答案

Python 自带电池 - ast.literal_eval():

Python comes with batteries included - that problem is solved by ast.literal_eval():

>>> import ast
>>> ast.literal_eval("[(0, 1), (1, 3), (2, 1), (3, 1), (4, 1)]")
[(0, 1), (1, 3), (2, 1), (3, 1), (4, 1)]
>>> ast.literal_eval("[(0, 1, 6), (1, 3,7), (3, 1,4), (3, 1,3), (8, 1,2)]")
[(0, 1, 6), (1, 3, 7), (3, 1, 4), (3, 1, 3), (8, 1, 2)]
>>> ast.literal_eval("[1,2,3,5,3]")
[1, 2, 3, 5, 3]

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