human
Solve the following python programming problem given the following code:
def keep_messages(* keys) : 
    'Prevents specific values from being removed during the processing of
    the decorated view. If this decorator is used with no args, the entire
    flash is preserved.
    ' 
    def _keep_messages(view_method) : 
        def _wrapped_view_method(request, * args, **kwargs) : 
            if hasattr (request, CONTEXT_VAR) : 
                flash = getattr (request, CONTEXT_VAR) 
                flash.keep (* keys) 
                return view_method (request, * args, ** kwargs) 
return _wrapped_view_method 
if ((len (keys) == 1) and callable (view_method [0])) : 
        view_method = keys [0] 
        keys = [] 
        return _keep_messages (view_method) 
return _keep_messages 

    
    

    Fix the buggy line: if ((len (keys) == 1) and callable (view_method [0])) :
assistant
#Here is Python program to fix the buggy line: if ((len (keys) == 1) and callable (view_method [0])) :
.

if ((len (keys) == 1) and callable (keys [0])) :