old_contents: # SPDX-License-Identifier: MIT
  # Copyright (c) 2016, Elaborated Networks GmbH
  # Copyright (c) 2019, Mathias Laurin
  
  """The cipher package provide symmetric encryption and decryption.
  
  The API follows the recommendations from PEP 272 "API for Block
  Encryption Algorithms"
  
  """
  
  from . import AES, ARC4, ARIA, CHACHA20, DES, DES3, Blowfish, Camellia, DES3dbl
  from ._cipher import *
  
  __all__ = _cipher.__all__ + (
      "AES",
      "ARC4",
      "ARIA",
      "Blowfish",
      "Camellia",
      "DES",
      "DES3",
      "DES3dbl",
      "CHACHA20",
  )
  
new_contents: # SPDX-License-Identifier: MIT
  # Copyright (c) 2016, Elaborated Networks GmbH
  # Copyright (c) 2019, Mathias Laurin
  
  """The cipher package provide symmetric encryption and decryption.
  
  The API follows the recommendations from PEP 272 "API for Block
  Encryption Algorithms"
  
  """
  
  from . import AES, ARC4, ARIA, CHACHA20, DES, DES3, Blowfish, Camellia, DES3dbl
  from ._cipher import *
  from ._cipher import __all__ as _cipher_all
  
  __all__ = _cipher_all + (
      "AES",
      "ARC4",
      "ARIA",
      "Blowfish",
      "Camellia",
      "DES",
      "DES3",
      "DES3dbl",
      "CHACHA20",
  )
  
subject: Remove one "undefined-variable"