docstr: Sets the value formatting rule using d3 formatting mini-
  language which is similar to those of Python. See
  https://github.com/d3/d3-3.x-api-
  reference/blob/master/Formatting.md#d3_format
  
  The 'valueformat' property is a string and must be specified as:
    - A string
    - A number that will be converted to a string
  
  Returns
  -------
  str
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code: def valueformat(self):
      """
      Sets the value formatting rule using d3 formatting mini-
      language which is similar to those of Python. See
      https://github.com/d3/d3-3.x-api-
      reference/blob/master/Formatting.md#d3_format
  
      The 'valueformat' property is a string and must be specified as:
        - A string
        - A number that will be converted to a string
  
      Returns
      -------
      str
      """
      return self["valueformat"]
  
file_path: catboost/contrib/python/plotly/py2/plotly/graph_objs/indicator/_delta.py
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 13 for calling the Delta obj's underlying member method code with example usage: obj.valueformat() and returns: self