human
Solve the following python programming problem given the following code:
def get_imei(n) : 
    'Random IMEI generator. This function return random but not unique
    IMEI number. Based on code from http://stackoverflow.com/a/20733310
    ' 
    def luhn_residue(digits) : 
        'Luhn algorithm' 
        return (sum ((sum (divmod ((int (d) * (1 + (i % 2))), 10)) for (i, d) in enumerate (digits [: : (- 1)]))) % 10) 
part = ''.join ((str (random.randrange (0, 9)) for _ in range ((n - 1)))) 
    res = luhn_residue ('{}{}'.format (n, 0)) 
    return '{}{}'.format (part, ((- res) % 10)) 

    
    

    Fix the buggy line: res = luhn_residue ('{}{}'.format (n, 0))
assistant
#Here is Python code to fix the buggy line: res = luhn_residue ('{}{}'.

res = luhn_residue ('{}{}'.format (part, 0))