code: def from_raw_seed(cls, raw_seed):
          
          signing_key = ed25519.SigningKey(raw_seed)
          verifying_key = signing_key.get_verifying_key()
          return cls(verifying_key, signing_key)
docs: Generate a :class:`Keypair` object via a sequence of bytes.
  
          Typically these bytes are random, such as the usage of
          :func:`os.urandom` in :meth:`Keypair.random`. However this class method
          allows you to use an arbitrary sequence of bytes, provided the sequence
          is 32 bytes long.
  
          :param bytes raw_seed: A bytes object used as the seed for generating
              the keypair.
          :return: A new :class:`Keypair` derived by the raw secret seed.