code: def set_site_energies( self, energies ):
          
          self.site_energies = energies
          for site_label in energies:
              for site in self.sites:
                  if site.label == site_label:
                      site.energy = energies[ site_label ]
docs: Set the energies for every site in the lattice according to the site labels.
  
          Args:
              energies (Dict(Str:Float): Dictionary of energies for each site label, e.g.::
  
                  { 'A' : 1.0, 'B', 0.0 }
  
          Returns:
              None