layer1 = QgsMapLayerRegistry.instance().mapLayersByName("Sites_atelier_vienne")[0]

selfeat = layer1.selectedFeatures()

print selfeat
[]

layer1 = QgsMapLayerRegistry.instance().mapLayersByName("Sites_atelier_vienne")

for lay in layer1:
    if lay.selectedFeatureCount() > 0:
       laysel = lay
selfeat = laysel.selectedFeatures()