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

[metulburr]

,but I need to jump to advanced stuff because it will waste my time by staying or doing easy stuff.

Everyone needs to start at the beginning. You are trying to understand calculus while bypassing trig and algebra. Your trying to build a house without ever having built a wall or put in an electrical outlet. etc. etc. Its just not going to fly. For example, you should already have some ideas on how to go about your question, even if it is not the best approach. But you do not because you never have done the basics. 

I would suggest to put on hold what you are doing and do some basic 2d pygame only stuff. Make a couple games beforehand, like RPG top-down with a tile manager, a platformer like mario, etc. Give them the full works, like a menu system, multiple levels, level editor, add your own mechanics like stabyourself did with mario, etc.. These will get you the basics. After you are done with these you will not need to ask this question.