我想用AES算法加密一个文本。代码如下所示。但是当我运行这段代码时，我得到了以下错误：

Traceback (most recent call last):
  File "/home/a/AES/aes.py", line 159, in <module>
cipher = AES.new(key.encode('utf8'), AES.MODE_ECB)
  File "/home/a/anaconda3/envs/AES/lib/python3.9/site-packages/Crypto/Cipher/AES.py", line 232, in new
return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)
  File "/home/a/anaconda3/envs/AES/lib/python3.9/site-packages/Crypto/Cipher/__init__.py", line 79, in _create_cipher
return modes[mode](factory, **kwargs)
  File "/home/a/anaconda3/envs/AES/lib/python3.9/site-packages/Crypto/Cipher/_mode_ecb.py", line 216, in _create_ecb_cipher
cipher_state = factory._create_base_cipher(kwargs)
  File "/home/a/anaconda3/envs/AES/lib/python3.9/site-packages/Crypto/Cipher/AES.py", line 92, in _create_base_cipher
if len(key) not in key_size:
TypeError: argument of type 'int' is not iterable

密码：

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad

key = 'QwroeApp90652321'
AES.key_size=128
AES.block_size=128
plaintext = "wdrdooloo"
cipher = AES.new(key.encode('utf8'), AES.MODE_ECB)
msg =cipher.encrypt(pad(plaintext.encode('utf8'), 16))
print(msg.hex())

我想用128位密钥大小、128位块大小、PKCS7填充和ECB模式加密文本。
有谁能提出一个解决这个问题的方案吗？