code: def GetFileObjectByPathSpec(self, path_spec):
      
      file_entry = self.GetFileEntryByPathSpec(path_spec)
      if not file_entry:
        return None
  
      return file_entry.GetFileObject()
docs: 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.