@classmethod<EOL><INDENT>def _get_checked_errors(cls, options):<DEDENT>
checked_codes = cls._get_exclusive_error_codes(options)<EOL>if checked_codes is None:<EOL><INDENT>checked_codes = cls.DEFAULT_CONVENTION<EOL><DEDENT>cls._set_add_options(checked_codes, options)<EOL>return checked_codes<EOL>
Extract the codes needed to be checked from `options`.