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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 CacheFileSystem(self, path_spec, file_system):
 """Caches a file system object based on a path specification. Args: path_spec (PathSpec):
 path specification. file_system (FileSystem):
 file system object. """

    identifier = self._GetFileSystemCacheIdentifier(path_spec)
    self._file_system_cache.CacheObject(identifier, file_system)