将在String中读取的输入列表转换为Python中的列表 [英] Converting Input List that is read in String to List in Python

问题描述

我正在读取包含列表的文件.下面是输入文件.

I am reading a file that has list. Below is the input file.

[1,2,3,4]
[42]
[1,1,2,3,5,8]
[]

现在正如您所看到的，有一些列表被读取为字符串字符，我正在尝试将其转换为实际列表.下面是我正在使用的代码.

Now as you can see there are lists which is read as string character and I am trying to convert it into an actual list. Below is the code I'm using.

_list = list(sys.stdin.readline().strip())
_final_list = []
    for n in _list:
        try:
            n = int(n)
        except ValueError:
            continue
        if isinstance(n, int):
            _final_list.append(n)

现在我的代码可以正常工作，直到数字超过一位.例如42将变成4、2.这不是我想要的.

Now my code works fine until a number is more than one digit. For example 42 would become 4, 2. Which is not what I want.

我的代码生成以下结果.

My code generates below result.

[1, 2, 3, 4]
[4, 2] <--- FALSE
[1, 1, 2, 3, 5, 8]
[]

在不使用诸如 ast

推荐答案

我会去掉结尾并用逗号分开.

I would strip the endings and split by commas.

def str_to_list(s):
    return [int(i) for i in s.strip('][').split(',') if i]

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