code: def get_value(self, default=None):
          
          if default is None:
              default = ''
  
          try:
              text = self.currentText()
  
          except ValueError:
              lg.debug('Cannot convert "' + str(text) + '" to list. ' +
                       'Using default ' + str(default))
              text = default
              self.set_value(text)
  
          return text
docs: Get selection from widget.
  
          Parameters
          ----------
          default : str
              str for use by widget
  
          Returns
          -------
          str
              selected item from the combobox