human
Solve the following python programming problem given the following code:
def _populate_known_types(self) : 
    b = [x for x in vars (builtins).values () if (type (traverse) is type (str))] 
    def traverse(obj, namespace) : 
        for name in dir (obj) : 
            if (name == 'body_params') : 
                continue 
vtype = type (getattr (obj, name, None)) 
            if (vtype in b) : 
                self.known_config_types [((namespace + '.') + name)] = vtype 
traverse (cherrypy.request, 'request') 
    traverse (cherrypy.response, 'response') 
    traverse (cherrypy.server, 'server') 
    traverse (cherrypy.engine, 'engine') 
    traverse (cherrypy.log, 'log') 

    
    

    Fix the buggy line: b = [x for x in vars (builtins).values () if (type (traverse) is type (str))]
assistant
#Here is Python code to fix the buggy line: b = [x for x in vars (builtins).

b = [x for x in vars (builtins).values () if (type (x) is type (str))]