Creation of one node set on assembly level in Abaqus CAE

Hello,

 

 Let's assume I've selected one node in the following way:

 

a=mdb.models['Model-1'].rootAssembly

x=a.instances['Part1-1'].nodes[7]

Question:

How can I define a node set consists x only?

a.Set(name='TEMP', nodes=???)

 

Thank you in advance,

Marek Wojcik