code: def fo_pct(self):
          
          tots = self.team_totals
          return {
              t: tots[t]['won']/(1.0*tots[t]['total']) if tots[t]['total'] else 0.0
              for t in [ 'home', 'away' ]
          }
docs: Get the by team overall face-off win %.
          
          :returns: dict, ``{ 'home': %, 'away': % }``