code: def get_best_import_key(self, import_keys):
          
          rsa2048 = None
          rsa1024 = None
  
          for c_key in import_keys:
              if c_key is None \
                      or 'type' not in c_key \
                      or c_key['type'] is None:
                  logger.info("Invalid key: %s", c_key)
                  continue
  
              if rsa1024 is None and c_key['type'] == 'rsa1024':
                  rsa1024 = c_key
              if rsa2048 is None and c_key['type'] == 'rsa2048':
                  rsa2048 = c_key
  
          return rsa2048 if rsa2048 is not None else rsa1024
docs: Picks best RSA key for import from the import keys arrays.
          :param import_keys:
          :return: