code: def __init__(
      self, assigner: MergingWindowAssigner, state: MapState[W, W]
  ):
      self._window_assigner = assigner
      self._mapping = dict()
  
      for window_for_user, window_in_state in state.items():
          self._mapping[window_for_user] = window_in_state
  
      self._state = state
      self._initial_mapping = dict(self._mapping)
  
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 1 to create a new MergingWindowSet object from inherited base classes: Generic with example: obj = MergingWindowSet(assigner, state)