Follow up with this
if len(colliding_with) is not 0:
for sprite in colliding_with:
#will go through each sprite in colliding_with
#if your sprite has a unique ID like self.id try printing
print sprite.id
Follow up with this
if len(colliding_with) is not 0:
for sprite in colliding_with:
#will go through each sprite in colliding_with
#if your sprite has a unique ID like self.id try printing
print sprite.id