Method get_or_add

src/pptx/opc/package.py:526–535

Return str rId of `reltype` to `target_part`. The rId of an existing matching relationship is used if present. Otherwise, a new relationship is added and that rId is returned.

(self, reltype: str, target_part: Part)

        return len(self._rels)

    def get_or_add(self, reltype: str, target_part: Part) -> str:
        """Return str rId of `reltype` to `target_part`.

        The rId of an existing matching relationship is used if present. Otherwise, a new
        relationship is added and that rId is returned.
        """
        existing_rId = self._get_matching(reltype, target_part)
        return (
            self._add_relationship(reltype, target_part) if existing_rId is None else existing_rId
        )

    def get_or_add_ext_rel(self, reltype: str, target_ref: str) -> str:
        """Return str rId of external relationship of `reltype` to `target_ref`.