I need to find the position of all nodes in an object

I've selected a curve called pcurve
I need to find the x y position of all nodes in pcurve.
pcurve has only 4 nodes.

I can't figure out how to call each node and get PositionX or Y

the first nodes x I will call x1 and the y I will call y1
the second nodes I will call x2 and the y I will call y2
and so on.

Any ideas?

Thank you very much for saving my sanity.