从文本文件中以元组而不是字符串的形式读取列表的元组-Python [英] Read in tuple of lists from text file as tuple, not string - Python

问题描述

我有一个要读取的文本文件，其中包含元组的行.文本中的每个元组/行均采用('描述字符串'，[整数列表1]，[整数列表2])的形式.文本文件可能看起来像这样:

I have a text file I would like to read in that contains rows of tuples. Each tuple/row in text is in the form of ('description string', [list of integers 1], [list of integers 2]). Where the text file might look something like:

('项目1'，[1,2,3,4]，[4,3,2,1])
('item 2'，[]，[4,3,2,1])
('项目3，[1,2]，[])

('item 1', [1,2,3,4] , [4,3,2,1])
('item 2', [ ] , [4,3,2,1])
('item 3, [1,2] , [ ])

我希望能够从文本文件中读取每一行，然后将它们直接放入其中的函数中，

I would like to be able to read each line in from the text file, then place them directly into a function where,

function(string, list1, list2)

我知道每一行都是作为字符串读取的，但是我需要以某种方式提取此字符串.我一直在尝试使用string.split('，')，但是当我点击列表时就会遇到问题.有没有办法做到这一点，还是我必须以某种方式修改我的文本文件?

I know that each line is read in as a string, but I need to extract this string some how. I have been trying to use a string.split(','), but that comes into problems when I hit the lists. Is there a way to accomplish this or will I have to modify my text files some how?

我也有一个元组列表的文本文件，我想以类似的方式读取它，

I also have a text file of a list of tuples that I would like to read in similarly that is in the form of

[(1,2 ,,(3,4)，(5,6)，...]

[(1,2),(3,4),(5,6),...]

可能包含任何数量的元组.我想在列表中阅读它，并为列表中的每个元组做一个for循环.我认为这两个将使用大致相同的过程.

that may contain any amount of tuples. I would like to read it in a list and do a for loop for each tuple in the list. I figure these two will use roughly the same process.

推荐答案

使用eval怎么办?

编辑，请使用ast.literal_eval查看@Ignacio的答案.

EDIT See @Ignacio's answer using ast.literal_eval.

>>> c = eval("('item 1', [1,2,3,4] , [4,3,2,1])")
>>> c
('item 1', [1, 2, 3, 4], [4, 3, 2, 1])

仅当您100％确定文件内容时，我才建议这样做.

I would only recommend doing this if you are 100% sure of the contents of the file.

>>> def myFunc(myString, myList1, myList2):
...     print myString, myList1, myList2
... 
>>> myFunc(*eval("('item 1', [1,2,3,4] , [4,3,2,1])"))
item 1 [1, 2, 3, 4] [4, 3, 2, 1]

请参阅@Ignacio的答案……要安全得多.

See @Ignacio's answer... much, much safer.

应用ast会产生:

>>> import ast
>>> def myFunc(myString, myList1, myList2):
...     print myString, myList1, myList2
... 
>>> myFunc(*ast.literal_eval("('item 1', [1,2,3,4] , [4,3,2,1])"))
item 1 [1, 2, 3, 4] [4, 3, 2, 1]

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