human
Solve the following python programming problem given the following code:
def argument(* param_decls, **attrs) : 
    'Attaches an argument to the command.  All positional arguments are
    passed as parameter declarations to :class:`Argument`.
all keyword
    arguments are forwarded unchanged (except ``cls``).
    This is equivalent to creating an :class:`Argument` instance manually
    and attaching it to the :attr:`Command.params` list.

    :param cls: the argument class to instantiate.  This defaults to
                :class:`Argument`.
    ' 
    def decorator(f) : 
        ArgumentClass = attrs.pop ('cls', Argument) 
        _param_memo (f, ArgumentClass (param_decls, ** attrs)) 
        return f 
return attrs 

    
    

    Fix the buggy line: return attrs
assistant
#Here is Python code to fix the buggy line: return attrs
.

return def decorator(