human
Solve the following python programming problem given the following code:
def fake_get_container_factory(_swift_index_items = None) : 
    def fake_get_container(self, container, prefix = None, delimiter = None) : 
        index_items = [] 
        if _swift_index_items : 
            for i in _swift_index_items : 
                if (i [(- 1)] == '/') : 
                    index_items.append ({ 
                        'subdir' : os.path.join (prefix, i), 
}) 
else : 
                    index_items.append ({ 
                        'name' : os.path.join (prefix, i), 
                        'last_modified' : '2042-12-31T23:59:59', 
                        'bytes' : 4200, 
}) 
else : 
            if (_swift_index_items == []) : 
                name = prefix [len ('non-existent/') :] 
                p = os.path.join (base.samples_path ('samples'), name) 
                for i in os.listdir (p) : 
                    if os.path.isdir (os.path.join (p, i)) : 
                        index_items.append ({ 
                            'subdir' : os.path.join (prefix, (i + '/')), 
}) 
else : 
                        index_items.append ({ 
                            'name' : os.path.join (prefix, i), 
                            'last_modified' : '2042-12-31T23:59:59', 
                            'bytes' : 4200, 
}) 
else : 
                pass 
return ({ 
            
}, index_items) 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is Python program to fix = None, delimiter = None) : 
.
def fake_get_container(