def __init__(self, **kwargs):
        if 'url' not in kwargs:
            raise KeyError('No url provided for runtime.')

        self._kwargs = kwargs
        self._proc = None
        self._streamreader = None
        atexit.register(self.close)

        logging.info(self.__class__.__name__ % 'launching %s')
        self._launch()
dataset/ETHPy150Open zoofIO/flexx/flexx/webruntime/common.py/BaseRuntime.__init__/swapped operands of `%`