def add_relationships(self, relationships):
        """Add multiple new relationships to a entityset

        Args:
            relationships (list[tuple(str, str, str, str)] or list[Relationship]) : List of
                new relationships to add. Relationships are specified either as a :class:`.Relationship`
                object or a four element tuple identifying the parent and child columns:
                (parent_dataframe_name, parent_column_name, child_dataframe_name, child_column_name)
        """
        for rel in relationships:
            if isinstance(rel, Relationship):
                self.add_relationship(relationship=rel)
            else:
                self.add_relationship(*rel)
        return self
Add multiple new relationships to a entityset

        Args:
            relationships (list[tuple(str, str, str, str)] or list[Relationship]) : List of
                new relationships to add. Relationships are specified either as a :class:`.Relationship`
                object or a four element tuple identifying the parent and child columns:
                (parent_dataframe_name, parent_column_name, child_dataframe_name, child_column_name)
        
featuretools/entityset/entityset.py