human
Solve the following python programming problem given the following code:
def add_post_hook(self, request, results) : 
    if hasattr (cb, 'post_process') : 
        cb = request.callback 
        @ wraps (cb) 
        def wrapper(response) : 
            output = list (iterate_spider_output (cb (response))) 
            try : 
                results.startTest (self.testcase_post) 
                self.post_process (output) 
                results.stopTest (self.testcase_post) 
except AssertionError : 
                results.addFailure (self.testcase_post, sys.exc_info ()) 
except Exception : 
                results.addError (self.testcase_post, sys.exc_info ()) 
else : 
                results.addSuccess (self.testcase_post) 
finally : 
                return output 
request.callback = wrapper 
return request 

    
    

    Fix the buggy line: if hasattr (cb, 'post_process') :
assistant
#Here is Python program to fix the buggy line: if hasattr (cb, 'post_process') :
.

if hasattr (self, 'post_process') :