Add gr_add_xx from gnuradio import gr gr.add_v$(type.fcn)($vlen) IO Type type enum Complex complex fcn:cc Float float fcn:ff Int int fcn:ii Short short fcn:ss Num Inputs num_inputs 2 int Vec Length vlen 1 int $num_inputs > 1 $vlen > 0 in $type $vlen $num_inputs out $type $vlen