From: Benjamin Peterson <benjamin@python.org>
Date: Thu, 3 Jun 2010 21:21:03 +0000 (+0000)
Subject: use a set for membership testing
X-Git-Tag: v2.7rc1~41
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=3b95934e0585762661269d41b5a5d79f1b9c2244;p=python

use a set for membership testing
---

diff --git a/Lib/site.py b/Lib/site.py
index cbf3325166..9865cc940e 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -276,12 +276,12 @@ def getsitepackages():
     environment, and will return a list of full paths.
     """
     sitepackages = []
-    seen = []
+    seen = set()
 
     for prefix in PREFIXES:
         if not prefix or prefix in seen:
             continue
-        seen.append(prefix)
+        seen.add(prefix)
 
         if sys.platform in ('os2emx', 'riscos'):
             sitepackages.append(os.path.join(prefix, "Lib", "site-packages"))