@classmethod
    def _part_cls_for(cls, content_type):
        if content_type in cls.part_type_for:
            return cls.part_type_for[content_type]
        return cls.default_part_type
Return the custom part class registered for *content_type*, or the
dataset/ETHPy150Open python-openxml/python-docx/docx/opc/part.py/PartFactory._part_cls_for