input: 
  from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """
      Encrypts a given plaintext string using AES encryption in ECB mode.
      
      >>> encrypt(b'Hello, World!')
      b'\x10\xb7\xb9\x90\xd0\xac\xe1^~":@Q\xbb}3d'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """
      Decrypts a given ciphertext string using AES decryption in ECB mode.
      
      >>> decrypt(b'\x10\xb7\xb9\x90\xd0\xac\xe1^~":@Q\xbb}3d')
      b'Hello, World!'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)
  
output:     cipher = AES.new(key, AES.MODE_ECB)
      return cipher.decrypt(ciphertext)