def listdir(self):
        ls = os.listdir(self.folder)
        if self.extensions:
            foo= [x for x in ls if os.path.splitext(x)[1][1:] \
                                           in self.extensions]
	    return foo
        else:
            return ls
JSON string representing the rejected value.
dataset/ETHPy150Open sensepost/Snoopy/snoopy/server/bin/pytail_helper.py/LogWatcher.listdir--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/dev_appserver_apiserver.py/RequestRejectionError.ToJson