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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 promote_artifacts(self, promote_stage='latest'):
 """Promote artifact version to dest. Args: promote_stage (string):
 Stage that is being promoted """

        if promote_stage.lower() == 'alpha':
            self._sync_to_uri(self.s3_canary_uri)
        elif promote_stage.lower() == 'canary':
            self._sync_to_uri(self.s3_latest_uri)
        else:
            self._sync_to_uri(self.s3_latest_uri)