human
Solve the following python programming problem given the following code:
def POST(self) : 
    data = json.loads (web.data ()) 
    self.require (data, 'txhash', 'Prefetch requires txhash') 
    self.require (data, 'output_set', 'Prefetch requires output_set') 
    self.require (data, 'color_desc', 'Prefetch requires color_desc') 
    txhash = data.get ('txhash') 
    output_set = data.get ('output_set') 
    color_desc = data.get ('color_desc') 
    limit = data.get ('limit') 
    color_def = ColorDefinition.from_color_desc (9999, process) 
    tx_lookup = { 
        
} 
    def process(current_txhash, current_outindex) : 
        'For any tx out, process the colorvalues of the affecting
            inputs first and then scan that tx.
            ' 
        if (limit and (len (tx_lookup) > limit)) : 
            return 
if tx_lookup.get (current_txhash) : 
            return 
current_tx = blockchainstate.get_tx (current_txhash) 
        if (not current_tx) : 
            return 
tx_lookup [current_txhash] = blockchainstate.get_raw (current_txhash) 
        inputs = set () 
        inputs = inputs.union (color_def.get_affecting_inputs (current_tx, [current_outindex])) 
        for i in inputs : 
            process (i.prevout.hash, i.prevout.n) 
for oi in output_set : 
        process (txhash, oi) 
return tx_lookup 

    
    

    Fix the buggy line: color_def = ColorDefinition.from_color_desc (9999, process)
assistant
#Here is Python code to fix the buggy line: color_def = ColorDefinition.

color_def = ColorDefinition.from_color_desc (9999, color_desc)