def Start(self):
    for k, v in self._overrides.iteritems():
      self._saved_values[k] = config_lib.CONFIG.Get(k)
      try:
        config_lib.CONFIG.Set.old_target(k, v)
      except __HOLE__:
        config_lib.CONFIG.Set(k, v)
dataset/ETHPy150Open google/grr/grr/lib/test_lib.py/ConfigOverrider.Start