python crypt and encrypt

encrypt.py

from Crypto.Cipher import AES
from Crypto import Random
import base64

AESKEY = "jFa8*!9uiAS0!385&(lla$1dqae8#!da"

BS = 16
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s: s[0:-ord(s[-1])]


class AESCipher:
    def encrypt(self, raw):
        raw = pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(AESKEY, AES.MODE_CBC, iv)
        return base64.b64encode(iv + cipher.encrypt(raw))

    def decrypt(self, enc):
        enc = base64.b64decode(enc)
        iv = enc[:16]
        cipher = AES.new(AESKEY, AES.MODE_CBC, iv)
        return unpad(cipher.decrypt(enc[16:]))

Hi...
How can i encrypt a folder which contains no. of files???