Simple Base85 encode/decode script

base85.py

import argparse
import base64
import sys

parser = argparse.ArgumentParser()
parser.add_argument('command', choices=['encode', 'decode'])
parser.add_argument('--input', type=str, required=False)
parser.add_argument('--output', type=str, required=False)
args = parser.parse_args()

if not args.input:
    input = sys.stdin
else:
    input = open(args.input, "rb")

if not args.output:
    output = sys.stdout
else:
    output = open(args.output, "wb")

if args.command == 'encode':
    data = input.read().encode("UTF-8")
    result = base64.a85encode(data)
    output.write(result.decode("UTF-8"))
elif args.command == 'decode':
    data = input.read().encode("UTF-8")
    result = base64.a85decode(data)
    output.write(result.decode("UTF-8"))

input.close()
output.close()