code: def visualize(self, format='svg'):
          
          import ibis.expr.visualize as viz
  
          path = viz.draw(viz.to_graph(self), format=format)
          webbrowser.open('file://{}'.format(os.path.abspath(path)))
docs: Visualize an expression in the browser as an SVG image.
  
          Parameters
          ----------
          format : str, optional
              Defaults to ``'svg'``. Some additional formats are
              ``'jpeg'`` and ``'png'``. These are specified by the ``graphviz``
              Python library.
  
          Notes
          -----
          This method opens a web browser tab showing the image of the expression
          graph created by the code in :module:`ibis.expr.visualize`.
  
          Raises
          ------
          ImportError
              If ``graphviz`` is not installed.