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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 GetFileObjectByPathSpec(self, path_spec):
 """Retrieves a file-like object for a path specification. Args: path_spec (PathSpec):
 a path specification. Returns: FileIO: a file-like object or None if not available. """

    file_entry = self.GetFileEntryByPathSpec(path_spec)
    if not file_entry:
      return None

    return file_entry.GetFileObject()