Python script to a binary uint8 array (decimal numbers) to base64 formatted string

tobase64.py

#!~/.pyenv/shims/python3

# Usage:
# tobase64.py  [163,217,65,81,53,230,29,28,6,0,0,0,104,101,108,108,111,51]
# Output:
# o9lBUTXmHRwGAAAAaGVsbG8z

import base64
import sys
import json

if len(sys.argv) != 2:
  print(f"Expecting one argument of json array listing uint items. The argument was not provided. Arguments: {sys.argv}")
  exit(1)

json_string = sys.argv[1]
json_string = json_string.strip()

if not json_string.startswith("["):
  print(f"Expecting the provided argument is a json array and starts with '[', but it is: {json_string}")
  exit(2)

json_data = json.loads(json_string)
byte_array = bytearray(json_data)

print(base64.b64encode(byte_array).decode('utf-8'))