docstr: Sets the starting contour level value. Must be less than
  `contours.end`
  
  The 'start' property is a number and may be specified as:
    - An int or float
  
  Returns
  -------
  int|float
docstr_tok: ["Sets","the","starting","contour","level","value",".","Must","be","less","than","`","contours.end","`","The","'start","'","property","is","a","number","and","may","be","specified","as",":","-","An","int","or","float","Returns","--","--","--","-","int|float"]
code: def start(self):
      """
      Sets the starting contour level value. Must be less than
      `contours.end`
  
      The 'start' property is a number and may be specified as:
        - An int or float
  
      Returns
      -------
      int|float
      """
      return self["start"]
  
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 17 for calling the Y obj's underlying member method code with example usage: obj.start() and returns: self