code: def show(self, zero_to_efermi=True, ylim=None, smooth=False,
               smooth_tol=None):
          
          plt = self.get_plot(zero_to_efermi, ylim, smooth)
          plt.show()
docs: Show the plot using matplotlib.
  
          Args:
              zero_to_efermi: Automatically subtract off the Fermi energy from
                  the eigenvalues and plot (E-Ef).
              ylim: Specify the y-axis (energy) limits; by default None let
                  the code choose. It is vbm-4 and cbm+4 if insulator
                  efermi-10 and efermi+10 if metal
              smooth: interpolates the bands by a spline cubic
              smooth_tol (float) : tolerance for fitting spline to band data.
                  Default is None such that no tolerance will be used.