def extras_msg(extras):
if len(extras) == <NUM_LIT:1>:<EOL><INDENT>verb = "<STR_LIT>"<EOL><DEDENT>else:<EOL><INDENT>verb = "<STR_LIT>"<EOL><DEDENT>return "<STR_LIT:U+002CU+0020>".join(repr(extra) for extra in extras), verb<EOL>
Create an error message for extra items or properties.