how to delete a node

Coding Python Support
1

any example how to delete a cycles node?

with bpy or usng bpy.ops method

thanks

2 

node_tree.nodes.remove(<i>node</i>)
3

so do you need to do it thought the mat nodes tree
or can it be done from the object mat list ?

and do we use the node name itself?

thanks

4 

node_tree = bpy.data.materials['Material'].node_tree
node = node_tree.nodes['Diffuse BSDF']
node_tree.nodes.remove(node)

Doing it through the object list seems like the long way around.