diff --git a/Lib/lib2to3/fixes/fix_urllib.py b/Lib/lib2to3/fixes/fix_urllib.py
index 331e52a..1481cd9 100644
--- a/Lib/lib2to3/fixes/fix_urllib.py
+++ b/Lib/lib2to3/fixes/fix_urllib.py
@@ -12,7 +12,7 @@
 
 MAPPING = {"urllib":  [
                 ("urllib.request",
-                    ["URLOpener", "FancyURLOpener", "urlretrieve",
+                    ["URLopener", "FancyURLopener", "urlretrieve",
                      "_urlopener", "urlopen", "urlcleanup",
                      "pathname2url", "url2pathname"]),
                 ("urllib.parse",
diff --git a/Lib/lib2to3/main.py b/Lib/lib2to3/main.py
index 02bae37..20ee434 100644
--- a/Lib/lib2to3/main.py
+++ b/Lib/lib2to3/main.py
@@ -100,7 +100,7 @@
     parser.add_option("-j", "--processes", action="store", default=1,
                       type="int", help="Run 2to3 concurrently")
     parser.add_option("-x", "--nofix", action="append", default=[],
-                      help="Prevent a fixer from being run.")
+                      help="Prevent a transformation from being run")
     parser.add_option("-l", "--list-fixes", action="store_true",
                       help="List available transformations")
     parser.add_option("-p", "--print-function", action="store_true",
@@ -112,7 +112,7 @@
     parser.add_option("-w", "--write", action="store_true",
                       help="Write back modified files")
     parser.add_option("-n", "--nobackups", action="store_true", default=False,
-                      help="Don't write backups for modified files.")
+                      help="Don't write backups for modified files")
 
     # Parse command line arguments
     refactor_stdin = False
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
diff --git a/Lib/lib2to3/tests/test_refactor.py b/Lib/lib2to3/tests/test_refactor.py
index 35efe25..73122d8 100644
--- a/Lib/lib2to3/tests/test_refactor.py
+++ b/Lib/lib2to3/tests/test_refactor.py
@@ -223,6 +223,7 @@
                 "hi.py",
                 ".dumb",
                 ".after.py",
+                "notpy.npy",
                 "sappy"]
         expected = ["hi.py"]
         check(tree, expected)
diff --git a/Lib/lib2to3/tests/test_util.py b/Lib/lib2to3/tests/test_util.py
index 0ab7537..d2be82c 100644
--- a/Lib/lib2to3/tests/test_util.py
+++ b/Lib/lib2to3/tests/test_util.py
@@ -568,8 +568,8 @@
 
     def test_from_import(self):
         node = parse('bar()')
-        fixer_util.touch_import("cgi", "escape", node)
-        self.assertEqual(str(node), 'from cgi import escape\nbar()\n\n')
+        fixer_util.touch_import("html", "escape", node)
+        self.assertEqual(str(node), 'from html import escape\nbar()\n\n')
 
     def test_name_import(self):
         node = parse('bar()')