Updates list attributes by extension rather than by replacement. Works in conjunction with the OptionParser.lists instance attribute.
There are no implemented interfaces.
There are no attributes in this class.
copy()
Return a shallow copy of self.
ensure_value(attr, value)
read_file(filename, mode='careful')
read_module(modname, mode='careful')
update(other_dict, option_parser)
There are no known subclasses.