human
Solve the following python programming problem given the following code:
@ classmethod 
def factory(cls, global_conf, **local_conf) : 
    'Factory method for paste.deploy.' 
    def _factory(app) : 
        conf = global_conf.copy () 
        conf.update (local_conf) 
        return cls (app, ** local_conf) 
return cls 

    
    

    Fix the buggy line: return cls
assistant
#Here is Python program to fix the buggy line: return cls
.

return def _factory(