How can i enable composite node in python? though with the codes i have searched in google , it still doesn't solve the problem, i want to enable one specific composite node like this :



and this is the inactive state:



From inactive state to active state , there is only such script indicated in Google 

scene = bpy.context.scene
compositing_node_tree = scene.node_tree
compositing_node_tree.nodes['os_composite'].select = True


But it just functions select node rather than enable node :



How can i enable this specific composite node in python?
Thanks if you have any ideas!
Set active node

Similarly to Set active image node with python

In the python console 

C = bpy.context
D = bpy.data

&gt;&gt;&gt; node = C.scene.node_tree.nodes['Composite']
&gt;&gt;&gt; node.select = True
&gt;&gt;&gt; C.scene.node_tree.nodes.active = node
&gt;&gt;&gt;