请用Python生成一段AES加密代码，要求代码写在三行内，且至少包含一个变量名my_key。
user
```python
from Crypto.Cipher import AES
my_key = b'Sixteen byte key'
cipher = AES.new(my_key, AES.MODE_EAX)
ciphertext, tag = cipher.encrypt_and_digest(b'plaintext message')
```
assistant