docstr: Sets the value formatting rule using d3 formatting mini-
  languages which are very similar to those in Python. For
  numbers, see:
  https://github.com/d3/d3-format/tree/v1.4.5#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-
      languages which are very similar to those in Python. For
      numbers, see:
      https://github.com/d3/d3-format/tree/v1.4.5#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"]
  
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 17 for calling the Delta obj's underlying member method code with example usage: obj.valueformat() and returns: self