code: def get_absolute_time(self, key):
          
          keyframe = self.dct[key]
          try:
              # if absolute time is already calculated, return that
              return keyframe['__abs_time__']
          except KeyError:
              # if not, calculate by adding relative time to parent's time
              if keyframe['parent'] is None:
                  keyframe['__abs_time__'] = keyframe['time']
              else:
                  parent_time = self.get_absolute_time(keyframe['parent'])
                  abs_time = keyframe['time'] + parent_time
                  keyframe['__abs_time__'] = abs_time
              return keyframe['__abs_time__']
docs: Returns the absolute time position of the key.
  
          If absolute time positions are not calculated, then this function
          calculates it.