def add_error(self, error):
        assert isinstance(error, Exception)
        self._error = error
Initialization that happens once per user.
dataset/ETHPy150Open mbedmicro/pyOCD/pyOCD/pyDAPAccess/dap_access_usb.py/_Transfer.add_error--crossover with--dataset/ETHPy150Open mozilla-services/readinglist/loadtests/loadtest/__init__.py/TestBasic.__init__