<s> class Filter : <EOL> def __init__ ( self , callback ) : <EOL> self . callback = callback <EOL> def check ( self , ip , paramslist , headers ) : <EOL> def params ( key , default = None , l = paramslist ) : <EOL> if l . has_key ( key ) : <EOL> return l [ key ] [ <NUM_LIT:0> ] <EOL> return default <EOL> return None </s>
