title: AttributeError error connecting to redis cluster in Python 3.8
body: <p>I am attempting to connect to a redis cluster using the RedisCluster module in python 3.8.</p>
  <pre><code>redis-py-cluster==2.1.0
  </code></pre>
  <p>UPDATE: The connection works now after adding ssl=True.</p>
  <p>However there is still an AttributeError being thrown which is a concern. Is this a possible bug with the rediscluster module?</p>
  <pre><code>  from rediscluster import RedisCluster
  
      _host = os.getenv('REDIS_HOST')
      _port = os.getenv('REDIS_PORT', 6379)
      _password = os.getenv('REDIS_PASSWORD')
  
      try:
        startup_nodes = [{&quot;host&quot;: _host, &quot;port&quot;: _port}]
        _redis_client = RedisCluster(startup_nodes=startup_nodes, decode_responses=True, ssl=True, password=_password)
      except Exception as x:
        print(x)
  </code></pre>
  <p>Error message:</p>
  <pre><code>{&quot;event&quot;: &quot;Starting gunicorn 20.0.4&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.031445Z&quot;}
  {&quot;event&quot;: &quot;Listening at: http://0.0.0.0:8081 (1)&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.032004Z&quot;}
  {&quot;event&quot;: &quot;Using worker: sync&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.032130Z&quot;}
  {&quot;event&quot;: &quot;Booting worker with pid: 8&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.035492Z&quot;}
  {&quot;event&quot;: &quot;Booting worker with pid: 9&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.072118Z&quot;}
  {&quot;event&quot;: &quot;Booting worker with pid: 10&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.172707Z&quot;}
  {&quot;event&quot;: &quot;Booting worker with pid: 11&quot;, &quot;logger&quot;: &quot;gunicorn.error&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:28.279041Z&quot;}
  {&quot;event&quot;: &quot;Created new instance of RedisCluster client instance&quot;, &quot;logger&quot;: &quot;rediscluster.client&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:59.366757Z&quot;}
  {&quot;event&quot;: &quot;Patching connection_class to SSLClusterConnection&quot;, &quot;logger&quot;: &quot;rediscluster.client&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:59.366940Z&quot;}
  {&quot;event&quot;: &quot;Using ClusterConnectionPool&quot;, &quot;logger&quot;: &quot;rediscluster.client&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:59.367051Z&quot;}
  {&quot;event&quot;: &quot;Creating new ClusterConnectionPool instance&quot;, &quot;logger&quot;: &quot;rediscluster.connection&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:59.367167Z&quot;}
  Exception ignored in: &lt;function Redis.__del__ at 0x7fbc965cd820&gt;
  Traceback (most recent call last):
    File &quot;/usr/local/lib/python3.8/site-packages/redis/client.py&quot;, line 885, in __del__
      self.close()
    File &quot;/usr/local/lib/python3.8/site-packages/redis/client.py&quot;, line 888, in close
      conn = self.connection
  AttributeError: 'RedisCluster' object has no attribute 'connection'
  {&quot;event&quot;: &quot;10.255.0.2 - - [29/Sep/2020:18:20:59 +0000] \&quot;GET /lookup/URN-3:IIIF_DEMO:10001 HTTP/1.1\&quot; 200 3 \&quot;-\&quot; \&quot;PostmanRuntime/7.26.5\&quot;&quot;, &quot;logger&quot;: &quot;gunicorn.access&quot;, &quot;level&quot;: &quot;info&quot;, &quot;timestamp&quot;: &quot;2020-09-29T18:20:59.515711Z&quot;}
  </code></pre>