2
Try using os.walk:
import os
root_folder = r'/home/bera/Downloads' #Change to match your main folder
for root,folders,files in os.walk(root_folder):
for file in files:
if file.endswith('.kml'):
vl = QgsVectorLayer(os.path.join(root,file), os.path.splitext(file)[0]) #Create vector layer
QgsProject.instance().addMapLayer(vl)...
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