test.py

#!/usr/bin/env python

import random
from json import dump


def get_matrix_value():
    return random.randint(10000, 99999)


def main():
    matrix = dict(
        (str(x), v) for x in range(50) for v in [dict((str(a), get_matrix_value()) for a in range(50))]
    )
    with open('test', 'w') as f:
        dump(matrix, f)


if __name__ == "__main__":
    main()