Manipulating geometry of layer in PyQGIS

Question

I went through different Stack Overflow questions, tutorials and the official PyQGIS cookbook. Somehow I cannot make a basic manipulation of the geometry of a layer's features.

This is the code I try to run. All that happens is that the layer is loaded into the project totally unchanged and the print(new) gives me the old coordinate values (but the print(geometry()) inside the loop gives me the correct new geometry). Is it because it is a .kmz file?

import os 
from qgis.core import (
    QgsVectorLayer
)

layer = QgsVectorLayer("/my_layer.kmz", "myLayer", "ogr")
layer.startEditing()

for f in layer.getFeatures():
    id = f.id()
    geom = f.geometry()
    geom.translate(10,10)
    f.setGeometry(geom)
    layer.dataProvider().changeGeometryValues({ id : geom })
    print(f.geometry())

layer.commitChanges()

#Check if new geometry was written into layer
for f in layer.getFeatures():
    new = f.geometry()
    print(new)

QgsProject.instance().addMapLayers([layer])

I am using QGIS 3.16

Answer 1

You code is not working because of your input data format.

I've tested your code is working with shapefile and GPKG but it does not work with KML and KMZ files.