human
Solve the following python programming problem given the following code:
def mock_world_factory(container) : 
    def returner() : 
        world = MockExampleContext () 
        container.append (world) 
        return world 
return container 

    
    

    Fix the buggy line: return container
assistant
#Here is Python code to fix the buggy line: return container
.

return def returner(