Viceroy | Python Fiddle

import uuid
class EM():
    def __init__():
        self.component_entity = {} #Component_class -> {entity_uuid -> Component()}
        self.entity_components = {} #Entity_uuid -> [Components(), ...]
        
        self.entity_tags = {} #Entity_uuid = [tag_a, ...]
        self.tag_entity = {} #Tag -> [entity_uuid_1, ...]
        
        self.system_component_class = {} #System -> [Component_class_a, ...]
        self.system_component = {} #System -> {Entity_uuid -> [Component_a(), ...]}
	
    def create_basic_entity(self, component):
    	return uuid.uuid1()
    
    def add_entity_component(self, uuid, component):
        store = self.component_entity.setdefault(component.__class__, {})
        store[uuid] = component
        
        store = self.entity_components.setdefault(uuid, [])
        store.append(component)
        
        for system, req in self.system_component_class.items():
        	if component.__class__ in req
            	store = self.system_component.setdefault(system, {})
                c_list = store.setdefault(uuid, [])
                c_list.append(component)
    
    def remove_entity_component(uuid, component):
        store = self.component_entity.get(component.__class__, None)
        store[uuid].remove(component) if store
        
        store = self.entity_components.get(uuid, None)
        store.remove(component) if store
        
        for system, req in self.system_component_class.items():
        	if component.__class__ in req
            	store = self.system_component.get(system, None)
                if store:
                	c_list = store.get(uuid, None)
                    if c_list:
                		c_list.remove(component)
	
    def get_entity_component(self, uuid, component_classes=[])
    	if len(component_classes) == 1
        	component_class = component_classes[0]
        	component = self.component_entity.get(uuid, None) # [C_a(), C_b()]
            if component:
                return component
        else
        	store = self.entity_components.get(uuid, None) # [C_a(), C_b()]
            if store:
                return [component for component in store if component.__class__ in component_classes]

Python Fiddle

Python Cloud IDE