def checkOSExists(f):
    return os.path.exists(f)
Triggers activity on the waker's file descriptor.
dataset/ETHPy150Open Esri/solutions-geoprocessing-toolbox/suitability/toolboxes/scripts/NAMDownload.py/checkOSExists--crossover with--dataset/ETHPy150Open CouchPotato/CouchPotatoServer/libs/tornado/platform/interface.py/Waker.wake