Merged revisions 85551,86156-86157,86464 via svnmerge from
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3

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  r85551 | benjamin.peterson | 2010-10-15 23:57:29 +0200 (Fr, 15 Okt 2010) | 1 line

  escape() is now in the html module
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  r86156 | georg.brandl | 2010-11-04 09:34:57 +0100 (Do, 04 Nov 2010) | 1 line

  Consistency fixes in option parser help texts.
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  r86157 | georg.brandl | 2010-11-04 09:35:30 +0100 (Do, 04 Nov 2010) | 1 line

  #10286: fix urllib class names.
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  r86464 | benjamin.peterson | 2010-11-14 16:28:52 +0100 (So, 14 Nov 2010) | 1 line

  match only .py files #10416
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diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index 54e00ee..ae5e40f 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -302,13 +302,14 @@
 
         Files and subdirectories starting with '.' are skipped.
         """
+        py_ext = os.extsep + "py"
         for dirpath, dirnames, filenames in os.walk(dir_name):
             self.log_debug("Descending into %s", dirpath)
             dirnames.sort()
             filenames.sort()
             for name in filenames:
-                if not name.startswith(".") and \
-                        os.path.splitext(name)[1].endswith("py"):
+                if (not name.startswith(".") and
+                    os.path.splitext(name)[1] == py_ext):
                     fullname = os.path.join(dirpath, name)
                     self.refactor_file(fullname, write, doctests_only)
             # Modify dirnames in-place to remove subdirs with leading dots