def match(self, stat):
    res = self._pattern.match(stat)
    if res:
      self._count += 1
      return self._target_format%res.groupdict()
    return None
add_subset method updates subset.data reference
dataset/ETHPy150Open agoragames/torus/torus/aggregates.py/Aggregate.match--crossover with--dataset/ETHPy150Open glue-viz/glue/glue/core/tests/test_data.py/TestData.test_add_subset_reparents_subset