Remove non-existent paths.

Lib/site.py

@@ -79,7 +79,7 @@ for dir in sys.path:
     # if they only differ in case); turn relative paths into absolute
     # paths.
     dir, dircase = makepath(dir)
-    if not dircase in _dirs_in_sys_path:
+    if not dircase in _dirs_in_sys_path and os.path.exists(dir):
         L.append(dir)
         _dirs_in_sys_path[dircase] = 1
 sys.path[:] = L

Misc/NEWS

@@ -276,6 +276,8 @@ Extension modules
 Library
 -------
 
+- site.py now removes paths that do not exist.
+
 - The ptcp154 codec was added for Kazakh character set support.
 
 - Support non-anonymous ftp URLs in urllib2.