def prefix(self, command):
        class Prefix(object):
            def __enter__(context):
                self._command_prefixes.append(command)

            def __exit__(context, *args):
                self._command_prefixes.pop()
        return Prefix()
EX: dict(donor=donor, street1='000 FakeTown', street2='', city='FakeyVille',
dataset/ETHPy150Open jonathanslenders/python-deployer/deployer/host/base.py/HostContext.prefix--crossover with--dataset/ETHPy150Open jumoconnect/openjumo/jumodjango/donation/models.py/DonorAddress.get_or_create