code: def get_state_window(self, window: W) -> W:
      if window in self._mapping:
          return self._mapping[window]
      else:
          return None
  
file_path: flink/flink-python/pyflink/fn_execution/datastream/window/merging_window_set.py
imports: from abc import ABC, abstractmethod
  from typing import TypeVar, Generic, Collection, Iterable
  from pyflink.datastream import MergingWindowAssigner
  from pyflink.datastream.state import MapState
label_desc: Use image node_id 3 for calling the MergingWindowSet obj's underlying member method code with example usage: obj.get_state_window(window) and returns: self, None