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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def returnJobReqs(self, jobReqs):
 """ This function returns the effective job requirements back to the pool after the job completes. It also deletes the local copies of files with the cache lock held. :param float jobReqs: Original size requirement of the job """

        # Since we are only reading this job's specific values from the state file, we don't
        # need a lock
        jobState = self._JobState(self._CacheState._load(self.cacheStateFile
                                                         ).jobState[self.jobID])
        for x in list(jobState.jobSpecificFiles.keys()):
            self.deleteLocalFile(x)
        with self._CacheState.open(self) as cacheInfo:
            cacheInfo.sigmaJob -= jobReqs