human
Solve the following python programming problem given the following code:
@ pytest.fixture (scope = 'function') 
def remove_output_folder(request) : 
    '
    Remove the output folder in case it exists on disk.
    ' 
    def finalizer_remove_output_folder() : 
        if os.path.exists ('output_folder') : 
            utils.rmtree ('output_folder') 
request.addfinalizer (request) 

    
    

    Fix the buggy line: request.addfinalizer (request)
assistant
#Here is Python program to fix the buggy line: request.

request.addfinalizer (def finalizer_remove_output_folder()