human
Solve the following python programming problem given the following code:
def change_flags(**kwargs) : 
    '
    Use this as a decorator to change the value of Theano config variable.

    Useful during tests.
    ' 
    def change_flags_exec(f) : 
        def inner(* args, **kwargs_) : 
            old_val = { 
                
} 
            for k in kwargs : 
                l = [v for v in theano.configparser._config_var_list if (v.fullname == k)] 
                assert (len (l) == 1) 
                old_val [k] = l [0].__get__ (True, None) 
try : 
                for k in kwargs : 
                    l = [v for v in theano.configparser._config_var_list if (v.fullname == k)] 
                    assert (len (l) == 1) 
                    l [0].__set__ (None, kwargs [k]) 
return f (* args, ** kwargs_) 
finally : 
                for k in kwargs : 
                    l = [v for v in theano.configparser._config_var_list if (v.fullname == k)] 
                    assert (len (l) == 1) 
                    l [0].__set__ (None, old_val [k]) 
inner.__name__ = f.__name__ 
        return inner 
return <MASK> 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: kwargs
assistant
#Here is a proper replacement for <MASK>.
def change_flags_exec(