How to find the location of an object and object at a given location?

[nilamo]

I have two question

1)how to find the object given the location of the object?

Let's say I draw a cube at coordinate x y z ,4 5 3 respectively.
I want Python to print "cube" when I search the coordinate 4,5,3.
How would I do it?
I can use a variable to keep track the coordinate of every object in the game,but I have infinite amount of object generated in the game scene(using infinite procedural generation)

2)how to find the location of the object given the object name?

Note:I am using OpenGL 
Note2:there must be something in OpenGL(or pygame) I can use to keep track of the location of all object in the game scene.
Is there?

You've got the conversation backward.  You don't ask python/pygame/opengl anything.  Because they don't track anything.  You do.  Instead of asking those things a question, you tell them things.  You have some objects, and you tell those libraries where to display those objects.  Nothing moves, unless you tell it to.  So there's nothing in opengl/pygame to track where things are... because you should already have that information.  Otherwise, how are you displaying it in the first place?