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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 _update_actions_len(self):
 """Update the actions_len field based on actions value."""

        if isinstance(self.actions, ListOfActions):
            self.actions_len = self.actions.get_size()
        else:
            self.actions_len = ListOfActions(self.actions).get_size()