human
I am working on the file "Devel/V05/Frame2D_Output.ipynb".
The first task is:
Nodes
Can you write Python code for it?
 ... Write me a the Python code you requested?
assistant
#Here is the Python code you requested.

 @extend
class Frame2D:
    
    def list_nodes(self):
        return [(n.id,n.x,n.y) for n in self.nodes.values()]

##test:
t = f.write_table('nodes','test-1')
t.file_name

##test:
%cat test-1.d/nodes.csv