input: 
  from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """Encrypt the given plaintext using AES encryption in ECB mode.
      >>> encrypt(b'Hello World')
      b'\\xfa\\x9fE\\xbeG\\xd5E\\x8d\\xb33$\\xcf.\\xb3s\\xadQ'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """Decrypt the given ciphertext using AES decryption in ECB mode.
      >>> decrypt(b'\\xfa\\x9fE\\xbeG\\xd5E\\x8d\\xb33$\\xcf.\\xb3s\\xadQ')
      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)