code: def method_file_cd(f):
      
      @wraps(f)
      def wrapper(self, *args, **kwargs):
          with preserve_current_directory():
              self.GetDirectory().cd()
              return f(self, *args, **kwargs)
      return wrapper
docs: A decorator to cd back to the original directory where this object was
      created (useful for any calls to TObject.Write).
      This function can decorate methods.