https://code.djangoproject.com/ticket/23763
From b07aa52e8a8e4c7fdc7265f75ce2e7992e657ae9 Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Tue, 4 Nov 2014 20:56:00 -0500
Subject: [PATCH] Added a dummy class for HTMLParserError; refs #23763.

---
 django/utils/html_parser.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/django/utils/html_parser.py b/django/utils/html_parser.py
index efe54227d326..ab1f65497891 100644
--- a/django/utils/html_parser.py
+++ b/django/utils/html_parser.py
@@ -9,7 +9,12 @@
     (current_version >= (3, 0) and current_version < (3, 2, 3))
 )
 
-HTMLParseError = _html_parser.HTMLParseError
+try:
+    HTMLParseError = _html_parser.HTMLParseError
+except AttributeError:
+    # create a dummy class for Python 3.5+ where it's been removed
+    class HTMLParseError(Exception):
+        pass
 
 if not use_workaround:
     if current_version >= (3, 4):