code: def fo_pct_by_zone(self):
          
          bz = self.by_zone
          return {
              t: {
                  z: bz[t][z]['won']/(1.0*bz[t][z]['total']) if bz[t][z]['total'] else 0.0
                  for z in self.__zones
                  if z != 'all'
              }
              for t in [ 'home', 'away' ]
              
          }
docs: Get the by team face-off win % by zone. Format is
              
          :returns: dict ``{ 'home/away': { 'off/def/neut': % } }``