def _load_source(self, filename):
        try:
            with open(filename, 'r') as stream:
                raw_data = yaml.load(stream)
            self._parse_raw_data(raw_data)
        except ScannerError as e:
            raise BootstrapSourceError(self.ERROR_PREFIX % "Error %s" % e.message)
dataset/ETHPy150Open CacheBrowser/cachebrowser/cachebrowser/bootstrap.py/LocalBootstrapSource._load_source/operator `+` -> `%`