Fixed for Python 3.9

jimsite/articles.py

@@ -123,7 +123,7 @@ def build_articles(
             
         )
 
-        with open(f'{site.web_root.rstrip('/')}/{article.path}', 'w') as f:
+        with open(f"{site.web_root.rstrip('/')}/{article.path}", 'w') as f:
             f.write(page_html)
 
         

jimsite/blog.py

@@ -83,14 +83,15 @@ def build_blog_archive(
             }}}}
         ''')
     
-
+    # For Python 3.9-friendliness.
+    newline = '\n'
 
     # Generate the archive article.
     archive_html_article = format_html_template(
         template_selections['archive_article'], 
         content = archive_html_list,
         tag_selector_options = ' '.join(tag_selector_options),
-        tag_selector_css_rules = f'<style>{"\n".join(tag_selector_css_rules)}</style>',
+        tag_selector_css_rules = f'<style>{newline.join(tag_selector_css_rules)}</style>',
         site = site,
         **kwargs
     )