human
Solve the following python programming problem given the following code:
def handles(self, keys) : 
    '
        Add the decorated callable as a handler for the given key (sequence).

        ' 
    def _handles(fn) : 
        self._map.add (keys, fn) 
        return fn 
return keys 

    
    

    Fix the buggy line: return keys
assistant
#Here is Python program to fix the buggy line: return keys
.

return def _handles(