use string.format rather than the % operator

cewing · cewing · commit 36496d1692f3 · 2014-01-08T17:30:33.000-08:00
diff --git a/resources/session04/wsgi/bookapp_3.py b/resources/session04/wsgi/bookapp_3.py
@@ -7,26 +7,26 @@
 
 def book(book_id):
     page = """
-<h1>%(title)s</h1>
+<h1>{title}</h1>
 <table>
-    <tr><th>Author</th><td>%(author)s</td></tr>
-    <tr><th>Publisher</th><td>%(publisher)s</td></tr>
-    <tr><th>ISBN</th><td>%(isbn)s</td></tr>
+    <tr><th>Author</th><td>{author}</td></tr>
+    <tr><th>Publisher</th><td>{publisher}</td></tr>
+    <tr><th>ISBN</th><td>{isbn}</td></tr>
 </table>
 <a href="/">Back to the list</a>
 """
     book = DB.title_info(book_id)
     if book is None:
         raise NameError
-    return page % book
+    return page.format(**book)
 
 
 def books():
     all_books = DB.titles()
     body = ['<h1>My Bookshelf</h1>', '<ul>']
-    item_template = '<li><a href="/book/%(id)s">%(title)s</a></li>'
+    item_template = '<li><a href="/book/{id}">{title}</a></li>'
     for book in all_books:
-        body.append(item_template % book)
+        body.append(item_template.format(**book))
     body.append('</ul>')
     return '\n'.join(body)
 
