读取存储在文本文件中的列表 [英] Reading a list stored in a text file

问题描述

我有一个文件，其内容采用python列表的形式，例如:

I have a file whose content is in the form of a python list such as the following:

['hello','how','are','you','doing','today','2016','10.004']

有什么方法可以将python文件读回到列表对象中吗?而不是使用.read()并将整个文件读取为字符串.

Is there any way to read the python file back into a list object? instead of using .read() and having the whole file just read as a string.

对于那些可能感兴趣的人，我遇到了使用(import ast)的奇怪问题，如上述问题的解决方案所示.

for those who may be interested i ran into a strange issue using (import ast) as suggested as a solution for the above problem.

我在其中使用的程序具有从yahoo finance python模块获取历史股票数据的功能.此函数与ast.literal_eval()无关.

the program i used it in has a function which fetches historical stock data from the yahoo finance python module. this function is in no way related or dependent on the function which used ast.literal_eval().

无论如何，每天收市后的每个晚上，我都会从Yahoo Finance收集新一批的历史数据，而昨晚我遇到了一个错误:simplejson.scanner.jsondecodeerror期望值.

anyways every night after market close i collect new batches of historical data from yahoo finance and last night i ran into an error : simplejson.scanner.jsondecodeerror expecting value.

这很奇怪，因为它可以收集某些公司的数据，却为其他公司抛出错误，并且有时可以为同一家公司工作，但是一分钟后它就无法工作.在尝试了各种方法以调试并解决问题后，我记得最近添加了import ast，并认为我应该尝试查看它是否可能有效果，在删除import ast之后，程序将恢复正常工作.

it was strange because it would collect data just fine for some companies but throw the error for others, and sometime work for the same company but a minute later it would not work. after trying all kinds of things to debug and solve the issue remembered that the import ast was recently added and thought i should try to see if it could have an effect, after removing the import ast the program went back to workin as it normally did.

有人知道为什么导入ast会引起问题吗? @Apero为什么最初警告您不要使用eval或ast.literal_eval?

does anybody know why import ast caused issues? @Apero why did you initially warn against using eval or ast.literal_eval?

推荐答案

您可以使用

You can use ast.literal_eval():

import ast

with open('filename.txt', 'r') as f:
    mylist = ast.literal_eval(f.read())

这篇关于读取存储在文本文件中的列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！