def file_exists(self, filepath):
        raise NotImplementedError()
od.iterkeys() -> an iterator over the keys in od
dataset/ETHPy150Open ARM-software/workload-automation/wlauto/core/device.py/Device.file_exists--crossover with--dataset/ETHPy150Open PythonCharmers/python-future/docs/3rd-party-py3k-compat-code/pandas_py3k.py/_OrderedDict.iterkeys