from Crypto.Cipher import AES

from Crypto.Random import get_random_bytes

data = b'secret data'

key = get_random_bytes(16)
cipher = AES.new(key, AES.MODE_EAX)
ciphertext, tag = cipher.encrypt_and_digest(data)

file_out = open("encrypted.bin", "wb")
[file_out.write(x) for x in (cipher.nonce, tag, ciphertext)]
file_out.close()