docs: def get_private_and_public(ctx, username, password, private, preset):
      """Print out server public and private."""
      session = SRPClientSession(
          SRPContext(username, password, prime=preset[0], generator=preset[1]),
          private=private)
  
      click.secho('Client private: %s' % session.private_b64)
      click.secho('Client public: %s' % session.public_b64)