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This allows easy iteration over all the parts of a geometry, regardless of the geometry's type. E.g. geometry = QgsGeometry.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' ) for part in geometry.parts(): print(part.asWkt()) geometry = QgsGeometry.fromWkt( 'LineString( 0 0, 10 10 )' ) for part in geometry.parts(): print(part.asWkt()) There are two iterators available. QgsGeometry.parts() gives a non-const iterator, allowing the parts to be modified in place: geometry = QgsGeometry.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' ) for part in geometry.parts(): part.transform(ct) For a const iteration, calling .const_parts() gives a const iterator, which cannot edit the parts but avoids a potentially expensive QgsGeometry detach and clone geometry = QgsGeometry.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' ) for part in geometry.const_parts(): print(part.x())