code: def _get_k8s_model_attribute(model_type, field_name):
      
      # if we get "service_account", return
      if field_name in model_type.attribute_map:
          return field_name
  
      # if we get "serviceAccount", then return "service_account"
      for key, value in model_type.attribute_map.items():
          if value == field_name:
              return key
      else:
          raise ValueError("'{}' did not have an attribute matching '{}'".format(model_type.__name__, field_name))
docs: Takes a model type and a Kubernetes API resource field name (such as
      "serviceAccount") and returns a related attribute name (such as
      "service_account") to be used with  kubernetes.client.models objects. It is
      impossible to prove a negative but it seems like it is always a question of
      making camelCase to snake_case but by using the provided 'attribute_map' we
      also ensure that the fields actually exist.
  
      Example of V1PodSpec's attribute_map:
      {
          'active_deadline_seconds': 'activeDeadlineSeconds',
          'affinity': 'affinity',
          'automount_service_account_token': 'automountServiceAccountToken',
          'containers': 'containers',
          'dns_policy': 'dnsPolicy',
          'host_aliases': 'hostAliases',
          'host_ipc': 'hostIPC',
          'host_network': 'hostNetwork',
          'host_pid': 'hostPID',
          'hostname': 'hostname',
          'image_pull_secrets': 'imagePullSecrets',
          'init_containers': 'initContainers',
          'node_name': 'nodeName',
          'node_selector': 'nodeSelector',
          'priority': 'priority',
          'priority_class_name': 'priorityClassName',
          'restart_policy': 'restartPolicy',
          'scheduler_name': 'schedulerName',
          'security_context': 'securityContext',
          'service_account': 'serviceAccount',
          'service_account_name': 'serviceAccountName',
          'subdomain': 'subdomain',
          'termination_grace_period_seconds': 'terminationGracePeriodSeconds',
          'tolerations': 'tolerations',
          'volumes': 'volumes'
      }