Secure String Generator

i_need_a_secure_string.py

from base64 import b64encode;
from os import urandom;
from sys import argv;

def random_bytes(bytes):
  random_bytes = urandom(bytes);
  return b64encode(random_bytes).decode('utf-8');

if len(argv) > 1:
  byte_value = int(argv[1])
else:
  byte_value = 64

print random_bytes(byte_value)

i_need_a_secure_string.rb

require 'securerandom'

byte_value = ARGV[0] ? Integer(ARGV[0]) : 64

puts SecureRandom.hex(byte_value)