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","."]
docstr: Checks if the map view contains a value for a given key.
docstr_tok: ["Checks","if","the","map","view","contains","a","value","for","a","given","key","."]
code: def contains(self, key: K) -> bool:
      """
      Checks if the map view contains a value for a given key.
      """
      return key in self._dict
  
imports: from abc import ABC, abstractmethod
  from typing import TypeVar, Generic, Iterable, List, Any, Iterator, Dict, Tuple
label_desc: Use image node_id 6 for calling the MapView obj's underlying member method code with example usage: obj.contains(key) and returns: unknown