def author_line(soup):
author_line = None<EOL>authors_json_data = authors_json(soup)<EOL>author_names = extract_author_line_names(authors_json_data)<EOL>if len(author_names) > <NUM_LIT:0>:<EOL><INDENT>author_line = format_author_line(author_names)<EOL><DEDENT>return author_line<EOL>
take preferred names from authors json and format them into an author line