code: def delete(obj, key=None):
      
      client = StrictRedis(**obj.REDIS_FOR_DYNACONF)
      holder = obj.get("ENVVAR_PREFIX_FOR_DYNACONF")
      if key:
          client.hdel(holder.upper(), key.upper())
          obj.unset(key)
      else:
          keys = client.hkeys(holder.upper())
          client.delete(holder.upper())
          obj.unset_all(keys)
docs: Delete a single key if specified, or all env if key is none
      :param obj: settings object
      :param key: key to delete from store location
      :return: None