How to use Python to convert file data to a two-dimensional list

Paste a code to do the data cleaning,

When doing data processing, the original file is converted to a certain format when it is processed.

Original file data:123.txt

1,3,42,3,51,2,3,52,5

Use Python to convert to a two-dimensional list:

#!/usr/bin/env python#coding=utf-8def Loaddataset ():        file = open ("123.txt", "R")    List_row = File.readlines ()     List_source = [] for    list_line in List_row:        list_line = List (List_line.strip (). Split (', '))                s = [] For        i in List_line:            s.append (int (i))                List_source.append (s)            return List_source

After running the program, the results are as follows:

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