When I write node.asCode() in python shell it returns this message:

Traceback (most recent call last):
File “<console>”, line 1, in <module>
NameError: name ‘node’ is not defined


how can I access node.asCode() within Houdini 17?

your node variable must be of type hou.Node(), from the error it seems you haven't even defined the node variable

create for example geo node at obj level, leave it at default name geo1

then run this
or directly this