What and how to load a set of matrices?

Question

Python

Hello, at the university they gave a task on numerical methods and there were difficulties in loading data from a file (an example of matrices is below, matrices A and B are interconnected). I tried in csv - everything is fine with one matrix, but I still don’t understand how to load 2-3 ... matrices (if this is possible in this task). Tell me, please, what is the best format to use and how to format and read it all. Thank you.

Answer 1

json IMHO is the best option:

{
"a": [
[0,1,2],
[3,4,5],
[6,7,8]
],
"b":[
[0,1,2,3],
[4,5,6,7],
[8,9,0,1]
]
}

Answer 2

Option 1 - separate files for matrices.
Option 2:
2 // number of matrices
2 2 // rows, columns in 1 matrix
1 2
3 4
3 4
3 3 // rows, columns in 1 matrix
1 2 3
4 5 6
7 8 9
3 option -- json