code: def set_header_visibility(self, column=False, row=False):
          
          if row:    self._widget.verticalHeader().show()
          else:      self._widget.verticalHeader().hide()
  
          if column: self._widget.horizontalHeader().show()
          else:      self._widget.horizontalHeader().hide()
  
          return self
docs: Sets whether we can see the column and row headers.