code: def import_users(self, connection_id, file_obj, upsert=False):
          
          return self.client.file_post(self._url('users-imports'),
                                       data={'connection_id': connection_id, 'upsert': str(upsert).lower()},
                                       files={'users': file_obj})
docs: Imports users to a connection from a file.
  
          Args:
              connection_id (str): The connection id of the connection to which
                  users will be inserted.
  
              file_obj (file): A file-like object to upload. The format for
                  this file is explained in: https://auth0.com/docs/bulk-import
  
          See: https://auth0.com/docs/api/management/v2#!/Jobs/post_users_imports