Python将文本文件中的列表作为列表导入

Question

[2, 'hello', 3, 'good'] - is stored in myfile.txt on one line


 with open(myfile,'r') as f:
        myList = f.readlines()

but when I try to retrieve the first index, so "2' by using myList[0], the first square brackets is retrieved.

How can I set the imported line into a list?

Answer 1

use the ast module to convert the string to a list object

Ex:

import ast
with open(myfile,'r') as f:
        data= f.read()
        myList = ast.literal_eval(data)

Answer 2

.readlines() method reads lines of text from file, separated with the new line character and returns a list, containing those lines, so that's not the case.

You could have read the contents of the file and eval it like this:

with open(myfile,'r') as f:
    my_list = eval(f.read())

Note, that the usage of eval is considered to be a really bad practice, as it allows to execute any python code written in the file.

Answer 3

You can use the json module for this (since a list is a valid json object):

import json
with open(myfile) as f:
    myList = json.load(f)

Answer 4

您可以这样做：mylist = mylist [1：-1] .split（“，”）[1：-1]删除了括号