Gates on the fly question

Gates on the fly script API question.
Does anyone know the difference of change_port and change_net?

change_port 只改变port的driver，change_net改变整个NET的driver，影响所有的FANOUT, 包括port，如果这个NET也是port的话。例子，
output THE_NET;
AND2X2 U0(.A(n0),.B(n1),.Y(THE_NET));
OR2X2 U1(.A(n2),.B(THE_NET),.Y(n3));
change_port('THE_NET', 'INVX1', '', '-');
不会影响U1的B输入
change_net('THE_NET', 'INVX1', '', '-');
就会影响U1的B输入

謝謝, awesome！