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: Returns all the keys in the map view.
docstr_tok: ["Returns","all","the","keys","in","the","map","view","."]
code: def keys(self) -> Iterable[K]:
      """
      Returns all the keys in the map view.
      """
      return self._dict.keys()
  
imports: from abc import ABC, abstractmethod
  from typing import TypeVar, Generic, Iterable, List, Any, Iterator, Dict, Tuple
label_desc: Use image node_id 8 for calling the MapView obj's underlying member method code with example usage: obj.keys() and returns: self