class_docstr: Client for working with the Cloud TPU API.
  
  This client is intended to be used for resolving tpu name to ip addresses.
  
  It's recommended to use this library as a contextlib to utilize all
  functionality.
docstr: Creates a new Cloud TPU API object.
  
  This works around an issue where the underlying HTTP connection sometimes
  times out when the script has been running for too long. Other methods in
  this object call this method to get a new API object whenever they need
  to communicate with the Cloud API.
  
  Raises:
    RuntimeError: If the dependent Python packages are missing.
  
  Returns:
    A Google Cloud TPU API object.
code: def _tpu_service(self):
      """Creates a new Cloud TPU API object.
  
      This works around an issue where the underlying HTTP connection sometimes
      times out when the script has been running for too long. Other methods in
      this object call this method to get a new API object whenever they need
      to communicate with the Cloud API.
  
      Raises:
        RuntimeError: If the dependent Python packages are missing.
  
      Returns:
        A Google Cloud TPU API object.
      """
      if self._service:
          return self._service
  
      if not _GOOGLE_API_CLIENT_INSTALLED:
          raise RuntimeError(
              "Missing runtime dependency on the Google API client. "
              "Run `pip install cloud-tpu-client` to fix."
          )
  
      credentials = self._credentials
      if credentials is None or credentials == "default":
          credentials = (
              client.GoogleCredentials.get_application_default()
          )
  
      if self._discovery_url:
          return discovery.build(
              "tpu",
              "v1",
              credentials=credentials,
              discoveryServiceUrl=self._discovery_url,
              cache_discovery=False,
          )
      else:
          return discovery.build(
              "tpu",
              "v1",
              credentials=credentials,
              cache_discovery=False,
          )
  
imports: from concurrent import futures
  import datetime
  import json
  import logging
  import os
  import time
  import urllib
  from absl import flags
label_desc: Use image node_id 5 for calling the Client obj's underlying member method code with example usage: obj._tpu_service() and returns: self, discovery, discovery