Python AES encrypt/decrypt

aes.py

from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
from Crypto.Util.Padding import pad, unpad

import base64

key = input("Key: ").encode()

def encrypt():
    iv = get_random_bytes(AES.block_size)
    cipher = AES.new(key, AES.MODE_CBC, iv)
    input_file = input("Cleartext file: ")
    with open(input_file) as file:
        cleartext = file.read()
    ciphertext = iv + cipher.encrypt(pad(cleartext.encode('utf-8'),
                AES.block_size))
    output_file = input("Ciphertext file: ")
    with open(output_file, "w") as file:
        file.write(base64.b64encode(ciphertext).decode())

def decrypt():
    input_file = input("Ciphertext file: ")
    with open(input_file) as file:
        ciphertext = file.read().encode()
    ciphertext = base64.b64decode(ciphertext)
    try:
        cipher = AES.new(key, AES.MODE_CBC, ciphertext[:AES.block_size])
        cleartext = unpad(cipher.decrypt(ciphertext[AES.block_size:]), AES.block_size)
        print(cleartext.decode())
    except:
        print("Decryption failed.")

choice = input("(E)ncrypt or (D)ecrypt: ").lower()
if choice == "e":
    encrypt()
elif choice == "d":
    decrypt()