class_docstr: A :class:`DataView` that provides dict-like functionality in the accumulator of an
  AggregateFunction when large amounts of data are expected.
class_docstr_tok: ["A",":","class",":","`","DataView","`","that","provides","dict-like","functionality","in","the","accumulator","of","an","AggregateFunction","when","large","amounts","of","data","are","expected","."]
code: def __init__(self):
      self._dict = dict()
  
imports: from abc import ABC, abstractmethod
  from typing import TypeVar, Generic, Iterable, List, Any, Iterator, Dict, Tuple
label_desc: Use image node_id 1 to create a new MapView object from inherited base classes: Generic with example: obj = MapView()