From: Benjamin Peterson <benjamin@python.org>
Date: Tue, 21 Feb 2012 04:13:20 +0000 (-0500)
Subject: a frozenset is better here
X-Git-Tag: v2.7.3rc1~24
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c59df7d4e916d12bd110701943277f77c1ebd4de;p=python

a frozenset is better here
---

diff --git a/Lib/re.py b/Lib/re.py
index cc3813f80a..3934f499c8 100644
--- a/Lib/re.py
+++ b/Lib/re.py
@@ -198,7 +198,8 @@ def template(pattern, flags=0):
     "Compile a template pattern, returning a pattern object"
     return _compile(pattern, flags|T)
 
-_alphanum = set('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890')
+_alphanum = frozenset(
+    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890")
 
 def escape(pattern):
     "Escape all non-alphanumeric characters in pattern."