Method update

dvc/repo/index.py:347–360

(self, stages: Iterable["Stage"])

        )

    def update(self, stages: Iterable["Stage"]) -> "Self":
        stages = set(stages)
        # we remove existing stages with same hashes at first
        # and then re-add the new ones later.
        stages_set = (set(self.stages) - stages) | stages
        return self.__class__(
            self.repo,
            stages=list(stages_set),
            metrics=self._metrics,
            plots=self._plots,
            params=self._params,
            artifacts=self._artifacts,
            datasets=self._datasets,
        )

    @classmethod
    def from_indexes(cls, repo, idxs: Iterable["Self"]) -> "Self":