code: def removeSingleCachedFile(self, fileStoreID):
          
          with self._CacheState.open(self) as cacheInfo:
              cachedFile = self.encodedFileID(fileStoreID)
              cachedFileStats = os.stat(cachedFile)
              # We know the file exists because this function was called in the if block.  So we
              # have to ensure nothing has changed since then.
              assert cachedFileStats.st_nlink <= self.nlinkThreshold, \
                     'Attempting to delete a global file that is in use by another job.'
  
              assert cachedFileStats.st_nlink >= self.nlinkThreshold, \
                     'A global file has too FEW links at deletion time. Our link threshold is incorrect!'
              # Remove the file size from the cached file size if the jobstore is not fileJobStore
              # and then delete the file
              os.remove(cachedFile)
              if self.nlinkThreshold != 2:
                  cacheInfo.cached -= cachedFileStats.st_size
              if not cacheInfo.isBalanced():
                  self.logToMaster('CACHE: The cache was not balanced on removing single file',
                                   logging.WARN)
              self.logToMaster('CACHE: Successfully removed file with ID \'%s\'.' % fileStoreID)
          return None
docs: Removes a single file described by the fileStoreID from the cache forcibly.