docstr: Sets the width (in px) of the legend item symbols (the part
  other than the title.text).
  
  The 'itemwidth' property is a number and may be specified as:
    - An int or float in the interval [30, inf]
  
  Returns
  -------
  int|float
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code: def itemwidth(self):
      """
      Sets the width (in px) of the legend item symbols (the part
      other than the title.text).
  
      The 'itemwidth' property is a number and may be specified as:
        - An int or float in the interval [30, inf]
  
      Returns
      -------
      int|float
      """
      return self["itemwidth"]
  
imports: from plotly.basedatatypes import BaseLayoutHierarchyType
  import copy
label_desc: Use image node_id 15 for calling the Legend obj's underlying member method code with example usage: obj.itemwidth() and returns: self