def __init__(self, target_collection, attr, creator=None,
                 getset_factory=None, proxy_factory=None,
                 proxy_bulk_set=None):
        self.target_collection = target_collection
        self.value_attr = attr
        self.creator = creator
        self.getset_factory = getset_factory
        self.proxy_factory = proxy_factory
        self.proxy_bulk_set = proxy_bulk_set

        self.owning_class = None
        self.key = '_%s_%s_%s' % (
            type(self).__name__, target_collection, id(self))
        self.collection_class = None
Returns a function which is able to convert a given operational
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/ext/associationproxy.py/AssociationProxy.__init__--crossover with--dataset/ETHPy150Open chromaway/ngcccbase/ngcccbase/txcons.py/TransactionSpecTransformer.get_tx_composer