Blender Game egine scripting error
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Description

System Information
Windows 7 64bit, Nvidia GTX 660 Ti

Blender Version
2.70

Short description of error
If I assign a new variable (for example posY for owner.position.y) it doesn't work

cont = bge.logic.getCurrentController()
owner = cont.owner
posY = owner.position.y
posY += 0.2

If I do the same thing without the last variable everything works just fine

cont = bge.logic.getCurrentController()
owner = cont.owner
owner.position.y += 0.2

Exact steps for others to reproduce the error

Create a text file with the following code

import bge

def main():
    cont = bge.logic.getCurrentController()
    owner = cont.owner
    owner.position.y += 0.2
main()

Add sensor Always. Activate TRUE level triggering
Add controller Python
Assign python to your text

The cube moves.

If you assign a variable to owner.position.y and set the variable += 0.2 then the cube doesn't move...

test_movement_script_error.blend524 KBDownload

Nicholas Kopakakis (blender5d) raised the priority of this task from to 90.

Python doesn't create a reference to the original property when you instance a float. It does if you do the whole array though:

cont = bge.logic.getCurrentController()
owner = cont.owner
position = owner.position
position.y += 0.2

It's not a bug, it's how things work, closing it.

Sorry.
I didn't know.
Thanks for the reply.