def _protect_consolidate(self, f):
    'Consolidate _data -- if the blocks have changed, then clear the\n        cache\n        '
    blocks_before = len(self._data.blocks)
    result = f()
    if (len(self._data.blocks) != blocks_before):
        self._clear_item_cache()
    return result
Consolidate _data -- if the blocks have changed, then clear the
cache
def _protect_consolidate(self, f):
    'Consolidate _data -- if the blocks have changed, then clear the\n        cache\n        '
    blocks_before = len(self._data.blocks)
    result = f()
    if (len(self._data.blocks) != blocks_before):
        self._clear_item_cache()
    return result