def exists (self, slice_name):
    try:
      return self._cache[slice_name].exists()
    except __HOLE__, e:
      sl = CachedSlice(slice_name)
      self._cache[slice_name] = sl
      return sl.exists()
dataset/ETHPy150Open fp7-ofelia/ocf/ofam/src/src/foam/flowvisor.py/SliceCache.exists