How to copy an object's (one axis) position ?

Basically, how do I copy and object’s world position but for only one axis?

Like: “FisrtOBposi.worldPosition = SecondOBposi.worldPosition” would copy all its axis’s positions… how do i go about doing the same thing but for only one or two axis [X,Y,Z] ???

x-axis
FisrtOBposi.worldPosition.x = SecondOBposi.worldPosition.x
y-axis
FisrtOBposi.worldPosition.y = SecondOBposi.worldPosition.y
z-axis
FisrtOBposi.worldPosition.z = SecondOBposi.worldPosition.z

X&Y-axis
FisrtOBposi.worldPosition.x = SecondOBposi.worldPosition.x
FisrtOBposi.worldPosition.y = SecondOBposi.worldPosition.y

etc…

hm, easy enough… should really brush up on my py programming knowledge. Thanks mate :]