def format_author_line(author_names):
author_line = None<EOL>if not author_names:<EOL><INDENT>return author_line<EOL><DEDENT>if len(author_names) <= <NUM_LIT:2>:<EOL><INDENT>author_line = "<STR_LIT:U+002CU+0020>".join(author_names)<EOL><DEDENT>elif len(author_names) > <NUM_LIT:2>:<EOL><INDENT>author_line = author_names[<NUM_LIT:0>] + "<STR_LIT>"<EOL><DEDENT>return author_line<EOL>
authorLine format depends on if there is 1, 2 or more than 2 authors