code: def set_option(name, value):
      
      d = globals()
  
      if name in {'get_option', 'set_option'} or name not in d:
          from ..exceptions import PlotnineError
          raise PlotnineError("Unknown option {}".format(name))
  
      old = d[name]
      d[name] = value
      return old
docs: Set package option
  
      Parameters
      ----------
      name : str
          Name of the option
      value : object
          New value of the option
  
      Returns
      -------
      old : object
          Old value of the option