Python script to convert base64 formatted string to uint8 binary data array

frombase64.py

#!~/.pyenv/shims/python3

# Usage:
# frombase64.py o9lBUTXmHRwGAAAAaGVsbG8z
# Output:
# [163,217,65,81,53,230,29,28,6,0,0,0,104,101,108,108,111,51]

import base64
import sys

if len(sys.argv) != 2:
  print(f"Expecting argument of base64 string, not provided. Arguments: {sys.argv}")
  exit(1)

string_key = sys.argv[1]

byte_array = base64.b64decode(string_key)
json_string = "[" + ",".join(map(lambda b: str(b), byte_array)) + "]"
print(json_string)