如何读取包含产生的整数列表的输出行 [英] How to read an output line containing a list of integers produced

问题描述

在特定目录中所有文件的倒数第二行(倒数第二行)中，我有一个整数列表，如下所示:

In my penultimate (next to last) line from all the files in a specific directory, I have a list of integers like this:

[142356, 12436546, 131434645, 56464]

我想从该特定目录的所有文件中读取倒数第二行，并再次将其用作包含相同值的新python脚本中的列表.这样我就可以再次处理这些列表.

I would like to read this penultimate line from all the files from that specific directory, and using it again as a list in my new python script containing the same values, of course. So I will be able to process again these lists.

所有文本文件名以"chr"开头，以".txt"结尾

All the text filenames start by "chr" and finish by ".txt"

推荐答案

您可以使用以下命令-iglob匹配文件名，literal_eval将该数据解析为列表，使用deque高效地获取文件的最后两行:

You can use the following - iglob to match the filenames, literal_eval to parse the data as a list, and a deque to efficiently get the last two lines of a file:

from collections import deque
from glob import iglob
import ast

def get_lists(pattern):
    for filename in iglob(pattern):
        with open(filename) as fin:
            penultimate = deque(fin, 2)[0]
            yield ast.literal_eval(penultimate)

data = list(get_lists('chr*.txt'))

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