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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 default_targets(self):
 """Default targets for `dvc repro` and `dvc pipeline`."""

        from dvc.stage import Stage

        msg = "assuming default target '{}'.".format(Stage.STAGE_FILE)
        logger.warning(msg)
        return [Stage.STAGE_FILE]