human
Solve the following python programming problem given the following code:
@ pytest.fixture 
def tracker_ctx(request) : 
    def fin() : 
        if hasattr (ctx, 'header') : 
            del ctx.header 
if hasattr (ctx, 'counter') : 
            del ctx.counter 
request.addfinalizer (request) 

    
    

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

request.addfinalizer (def fin()