code: def kernels_pull_cli(self,
                           kernel,
                           kernel_opt=None,
                           path=None,
                           metadata=False):
          
          kernel = kernel or kernel_opt
          effective_path = self.kernels_pull(
              kernel, path=path, metadata=metadata, quiet=False)
          if metadata:
              print('Source code and metadata downloaded to ' + effective_path)
          else:
              print('Source code downloaded to ' + effective_path)
docs: client wrapper for kernels_pull