import pygame

class DisplayLayer(object):
    def __init__(self):
        pass

class DisplayManager(object):
    def __init__(self):
        self.layers = {}
        
    def addLayer(self, layerName):
        if string in self.layers.keys():
            print("[DisplayManager] Layer %s is already in use!")
            return false
            
        else:
            self.layers[layerName] = DisplayLayer()