Remove inner rings from QgsGeometry polygon in QGIS Python

Question

I am a QGIS python user. I want to iterate over the rings of a polygon to remove holes in the polygon, so:

• I need to iterate over the rings in a QgsGeometry polygon
• I need to detect the main ring of the polygon
• I need to remove every ring, which is not the main ring

How can I do that in python QGIS?

Answer 1

if geom.isMultipart() is False: # if only simple polygon, calculate only for this
        polyg = geom.asPolygon() # transform to list of points
        for ring in polyg:
            # doSomething...FILL HOLES
else: # is multipart
        multi = geom.asMultiPolygon()
        for polyg in multi:
            for ring in polyg:
                # doSomething ... FILL HOLES

I use this for testing and looping trought multipolygon and/or simple polygon.