code: def get_namespace(self) -> N:
      return self._namespace
  
imports: import collections
  import time
  from enum import Enum
  from io import BytesIO
  from pyflink.common import Row
  from pyflink.datastream import TimerService
  from pyflink.fn_execution.datastream.timerservice import InternalTimer, K, N, InternalTimerService
label_desc: Use image node_id 4 for calling the InternalTimerImpl obj's underlying member method code with example usage: obj.get_namespace() and returns: self