input: 
  from Crypto.Cipher import AES
  
  key = b'Sixteen byte key'
  
  def encrypt(plaintext):
      """Encrypt the given plaintext using AES in ECB mode with the predefined key.
      
      >>> encrypt(b'Hello, World!')
      b'\xfc\xb1j\x11\xdd_,\xa0\xf1\x19\x8f.;=<;\x0e'
      """
      cipher = AES.new(key, AES.MODE_ECB)
      return cipher.encrypt(plaintext)
  
  def decrypt(ciphertext):
      """Decrypt the given ciphertext using AES in ECB mode with the predefined key.
      
      >>> decrypt(b'\xfc\xb1j\x11\xdd_,\xa0\xf1\x19\x8f.;=<;\x0e')
      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)