code: def _get_client(
      cls,
      request,
      single_connection_client=True,
      flushdb=True,
      from_url=None,
      **kwargs,
  ):
      """
      Helper for fixtures or tests that need a Redis client
  
      Uses the "--redis-url" command line argument for connection info. Unlike
      ConnectionPool.from_url, keyword arguments to this function override
      values specified in the URL.
      """
      if from_url is None:
          redis_url = request.config.getoption("--redis-url")
      else:
          redis_url = from_url
      if "protocol" not in redis_url and kwargs.get("protocol") is None:
          kwargs["protocol"] = request.config.getoption("--protocol")
  
      cluster_mode = REDIS_INFO["cluster_enabled"]
      if not cluster_mode:
          url_options = parse_url(redis_url)
          url_options.update(kwargs)
          pool = redis.ConnectionPool(**url_options)
          client = cls(connection_pool=pool)
      else:
          client = redis.RedisCluster.from_url(redis_url, **kwargs)
          single_connection_client = False
      if single_connection_client:
          client = client.client()
      if request:
  
          def teardown():
              if not cluster_mode:
                  if flushdb:
                      try:
                          client.flushdb()
                      except redis.ConnectionError:
                          # handle cases where a test disconnected a client
                          # just manually retry the flushdb
                          client.flushdb()
                  client.close()
                  client.connection_pool.disconnect()
              else:
                  cluster_teardown(client, flushdb)
  
          request.addfinalizer(teardown)
      return client
  
imports: import argparse
  import random
  import time
  from typing import Callable, TypeVar
  from unittest import mock
  from unittest.mock import Mock
  from urllib.parse import urlparse
  import pytest
  import redis
  from packaging.version import Version
  from redis.backoff import NoBackoff
  from redis.connection import Connection, parse_url
  from redis.exceptions import RedisClusterException
  from redis.retry import Retry
label_desc: Use image node_id 13 for calling a global function with example usage: _get_client(cls, request, single_connection_client, flushdb, from_url) and returns: client