pyqgis - Creating QGIS action which copies features between layers?

i tried (i never tried before...) to write a simple python code like action in QGIS on my "XXX" vector layer that:

1. open a layer "YYY"


2. copy the selected feature on my "XXX"layer


3. paste the selected feature in the "YYY" layer

Point 1) work ok, but point 2) don't work

Here is my code:

qgis.utils.iface.addVectorLayer("/home/stefano/Documenti/YYY.shp", "YYY", "ogr");
qgis.utils.iface.actionCopyFeatures()