def _find_keys(self, identity='image'):
        prefix = add_prefix('', identity)
        raw_keys = self._find_keys_raw(prefix) or []
        for raw_key in raw_keys:
            yield del_prefix(raw_key)

    #
    # Methods which key-value stores need to implement
    #
Finds and returns all keys for identity,
dataset/ETHPy150Open mariocesar/sorl-thumbnail/sorl/thumbnail/kvstores/base.py/KVStoreBase._find_keys