human
Solve the following python programming problem given the following code:
def prefix(transformers, default = None) : 
    "Returns a different transformer depending on the prefix at the end of the requested URL.
       If none match and no default is given no transformation takes place.

       should pass in a dict with the following format:

            {'[prefix]': transformation_action,
             ...
            }
    " 
    transformers = { prefix : (auto_kwargs (transformer) if transformer else transform) for (prefix, transformer) in transformers.items () } 
    default = (default and auto_kwargs (default)) 
    def transform(data, request = None, response = None) : 
        path = request.path 
        transformer = default 
        for (prefix_test, prefix_transformer) in transformers.items () : 
            if path.startswith (prefix_test) : 
                transformer = prefix_transformer 
                break 
return (transformer (data) if transformer else data) 
return transform 

    
    

    Fix the buggy line: transformers = { prefix : (auto_kwargs (transformer) if transformer else transform) for (prefix, transformer) in transformers.items () }
assistant
#Here is Python code to fix the buggy line: transformers = { prefix : (auto_kwargs (transformer) if transformer else transform) for (prefix, transformer) in transformers.

transformers = { prefix : (auto_kwargs (transformer) if transformer else transformer) for (prefix, transformer) in transformers.items () }