OdbMeshNode objects are created with the part.addNodes method.
import odbAccess session.odbs[name].parts[name].elementSets[name].nodes[i] session.odbs[name].parts[name].nodes[i] session.odbs[name].parts[name].nodeSets[name].nodes[i] session.odbs[name].parts[name].surfaces[name].nodes[i] session.odbs[name].rootAssembly.elementSets[name].nodes[i] session.odbs[name].rootAssembly.instances[name].elementSets[name]\ .nodes[i] session.odbs[name].rootAssembly.instances[name].nodes[i] session.odbs[name].rootAssembly.instances[name].nodeSets[name]\ .nodes[i] session.odbs[name].rootAssembly.instances[name].surfaces[name]\ .nodes[i] session.odbs[name].rootAssembly.nodes[i] session.odbs[name].rootAssembly.nodeSets[name].nodes[i] session.odbs[name].rootAssembly.surfaces[name].nodes[i] session.odbs[name].steps[name].frames[i].fieldOutputs[name].values[i]\ .instance.elementSets[name].nodes[i] session.odbs[name].steps[name].frames[i].fieldOutputs[name].values[i]\ .instance.nodes[i] session.odbs[name].steps[name].frames[i].fieldOutputs[name].values[i]\ .instance.nodeSets[name].nodes[i] session.odbs[name].steps[name].frames[i].fieldOutputs[name].values[i]\ .instance.surfaces[name].nodes[i]