From 2bcab3d589de9b16ca7b9405b452fd47e2c094b0 Mon Sep 17 00:00:00 2001
From: Barry Warsaw
Date: Tue, 22 Nov 2016 09:43:49 -0500
Subject: Start porting to Python 3.6

---
 BREAKS.rst                             | 5 +++++
 src/mailman/handlers/subject_prefix.py | 2 +-
 tox.ini                                | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 BREAKS.rst

diff --git a/BREAKS.rst b/BREAKS.rst
new file mode 100644
index 000000000..020126ad1
--- /dev/null
+++ b/BREAKS.rst
@@ -0,0 +1,5 @@
+======================
+ Python 3.6 breakages
+======================
+
+* https://bugs.python.org/issue27030
diff --git a/src/mailman/handlers/subject_prefix.py b/src/mailman/handlers/subject_prefix.py
index ff728d92e..5dcfe410a 100644
--- a/src/mailman/handlers/subject_prefix.py
+++ b/src/mailman/handlers/subject_prefix.py
@@ -158,7 +158,7 @@ class SubjectPrefix:
         prefix_pattern = re.escape(prefix)
         # Unescape '%'.
         prefix_pattern = '%'.join(prefix_pattern.split(r'\%'))
-        p = re.compile('%\d*d')
+        p = re.compile(r'%\d*d')
         if p.search(prefix, 1):
             # The prefix has number, so we should search prefix w/number in
             # subject.  Also, force new style.
diff --git a/tox.ini b/tox.ini
index c015cc699..7892b557a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {py34,py35}{,-coverage,-diffcov}{,-pg}{,-mysql},qa
+envlist = {py34,py35,py36}{,-coverage,-diffcov}{,-pg}{,-mysql},qa
 recreate = True
 skip_missing_interpreters = True
 
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