docstr: Rotates the map along parallels (in degrees East). Defaults to
  the center of the `lonaxis.range` values.
  
  The 'lon' property is a number and may be specified as:
    - An int or float
  
  Returns
  -------
  int|float
code: def lon(self):
      """
      Rotates the map along parallels (in degrees East). Defaults to
      the center of the `lonaxis.range` values.
  
      The 'lon' property is a number and may be specified as:
        - An int or float
  
      Returns
      -------
      int|float
      """
      return self["lon"]
  
file_path: plotly.py/packages/python/plotly/plotly/graph_objs/layout/geo/projection/_rotation.py
imports: from plotly.basedatatypes import BaseLayoutHierarchyType
  import copy
label_desc: Use image node_id 3 for calling the Rotation obj's underlying member method code with example usage: obj.lon() and returns: self