def _update_credential(self, key, cred):
        self._data[key] = cred
        self._write()
Implementation of Reporter callback.
dataset/ETHPy150Open google/oauth2client/oauth2client/contrib/multistore_file.py/_MultiStore._update_credential--crossover with--dataset/ETHPy150Open pantsbuild/pants/src/python/pants/reporting/quiet_reporter.py/QuietReporter.handle_output