code: def pie(self, key="wall_time", minfract=0.05, ax=None, **kwargs):
          
          ax, fig, plt = get_ax_fig_plt(ax=ax)
          # Set aspect ratio to be equal so that pie is drawn as a circle.
          ax.axis("equal")
          # Don't show section whose value is less that minfract
          labels, vals = self.names_and_values(key, minfract=minfract)
          ax.pie(vals, explode=None, labels=labels, autopct='%1.1f%%', shadow=True)
          return fig
docs: Plot pie chart for this timer.
  
          Args:
              key: Keyword used to extract data from the timer.
              minfract: Don't show sections whose relative weight is less that minfract.
              ax: matplotlib :class:`Axes` or None if a new figure should be created.
  
          Returns:
              `matplotlib` figure