code: def total_coverage(self):
          '''Returns the sum of COV data, if present. Otherwise returns None'''
          if 'COV' in self.FORMAT:
              return sum([int(x) for x in self.FORMAT['COV'].split(',')])
          else:
              return Nonf total_coverage(self):
          '''Returns the sum of COV data, if present. Otherwise returns None'''
          if 'COV' in self.FORMAT:
              return sum([int(x) for x in self.FORMAT['COV'].split(',')])
          else:
              return None
docs: Returns the sum of COV data, if present. Otherwise returns None