class_docstr: An expression for generating arrays by cumulatively summing a single
  column from a ``ColumnDataSource``.
class_docstr_tok: ["An","expression","for","generating","arrays","by","cumulatively","summing","a","single","column","from","a","``","ColumnDataSource","``","."]
code: def __init__(self, *args, **kwargs) -> None:
      super().__init__(*args, **kwargs)
  
imports: from __future__ import annotations
  import logging
  from math import inf
  from ..core.enums import Direction
  from ..core.has_props import abstract
  from ..core.properties import AngleSpec, AnyRef, Bool, Dict, Enum, Float, Instance, Nullable, NumberSpec, Required, Seq, String, field
  from ..model import Model
label_desc: Use image node_id 1 to create a new CumSum object from inherited base classes: Expression with example: obj = CumSum()