>>> s = "[5, 3, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 3, 4, 5]"
>>> q = [int(n) for n in s if not n in ", []"]
>>> print(q)
>>> [5, 3, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 3, 4, 5]

import struct
import json
import os


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


# 15 bytes (unsigned char) (0 - 255)
# little endian (doesn't matter with single bytes)
MY_STRUCT = "<15B"


def filesize(file):
    def human(size):
        for unit in ("Bytes", "KiB", "MiB"):
            if size < 1024:
                break
            size /= 1024

        return f"{size:.0f} {unit}"

    return f"{file:<16s}: {human(os.stat(file)[6])}"


def write_struct(data: list[int], file_out: str):
    """
    Writes 15 bytes to a file as a struct.
    """
    if len(data) != 15:
        raise ValueError("Data must be consist of 15 integers as iterable (list or tuple)")

    with open(file_out, "wb") as fd_out:
        fd_out.write(struct.pack(MY_STRUCT, *data))


def write_json(data: list[int], file_out: str):
    """
    Write the content of the list to a json file.
    """
    with open(file_out, "w") as fd_out:
        json.dump(data, fd_out)


def read_struct(file_in: str) -> list[int]:
    """
    Read struct from file and return the result.
    """
    with open(file_in, "rb") as fd_in:
        # struct.unpack returns the data in a tuple, not a list
        # converting to a list to fit the type hint
        return list(struct.unpack(MY_STRUCT, fd_in.read()))


def read_json(file_in: str) -> list[int]:
    """
    Read json from file and return the result.
    """
    with open(file_in) as fd_in:
        return json.load(fd_in)


write_struct(DATA, "data_struct.bin")
write_json(DATA, "data_json.json")

data_from_struct = read_struct("data_struct.bin")
data_from_json = read_json("data_json.json")

print("data_from_struct:", data_from_struct)
print("data_from_json:  ", data_from_json)


print(filesize("data_struct.bin"))
print(filesize("data_json.json"))