@@ -436,6 +436,13 @@ def join_header_words(lists):
         if attr: headers.append("; ".join(attr))
     return ", ".join(headers)
 
+def strip_quotes(text):
+    if text.startswith('"'):
+        text = text[1:]
+    if text.endswith('"'):
+        text = text[:-1]
+    return text
+
 def parse_ns_headers(ns_headers):
     """Ad-hoc parser for Netscape protocol cookie-attributes.
 
@@ -453,7 +460,7 @@ def parse_ns_headers(ns_headers):
     """
     known_attrs = ("expires", "domain", "path", "secure",
                    # RFC 2109 attrs (may turn up in Netscape cookies, too)
-                   "port", "max-age")
+                   "version", "port", "max-age")
 
     result = []
     for ns_header in ns_headers:
@@ -473,12 +480,11 @@ def parse_ns_headers(ns_headers):
                     k = lc
                 if k == "version":
                     # This is an RFC 2109 cookie.
+                    v = strip_quotes(v)
                     version_set = True
                 if k == "expires":
                     # convert expires date to seconds since epoch
-                    if v.startswith('"'): v = v[1:]
-                    if v.endswith('"'): v = v[:-1]
-                    v = http2time(v)  # None if invalid
+                    v = http2time(strip_quotes(v))  # None if invalid
             pairs.append((k, v))
 
         if pairs:
@@ -1446,7 +1452,11 @@ def _cookie_from_cookie_tuple(self, tup, request):
 
         # set the easy defaults
         version = standard.get("version", None)
-        if version is not None: version = int(version)
+        if version is not None:
+            try:
+                version = int(version)
+            except ValueError:
+                return None  # invalid version, ignore cookie
         secure = standard.get("secure", False)
         # (discard is also set if expires is Absent)
         discard = standard.get("discard", False)
 
@@ -273,12 +273,12 @@ 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"))
 
@@ -664,6 +664,7 @@ def _tracked(self, t):
         gc.collect()
         self.assertTrue(gc.is_tracked(t), t)
 
+    @support.cpython_only
     def test_track_literals(self):
         # Test GC-optimization of dict literals
         x, y, z, w = 1.5, "a", (1, None), []
@@ -681,6 +682,7 @@ def test_track_literals(self):
         self._tracked({1: {}})
         self._tracked({1: set()})
 
+    @support.cpython_only
     def test_track_dynamic(self):
         # Test GC-optimization of dynamically-created dicts
         class MyObject(object):
@@ -744,6 +746,7 @@ class MyObject(object):
         d.update([(x, y), (z, w)])
         self._tracked(d)
 
+    @support.cpython_only
     def test_track_subtypes(self):
         # Dict subtypes are always tracked
         class MyDict(dict):
 
@@ -97,6 +97,7 @@ def test_http2time_garbage(self):
 
 
 class HeaderTests(TestCase):
+
     def test_parse_ns_headers(self):
         # quotes should be stripped
         expected = [[('foo', 'bar'), ('expires', 2209069412), ('version', '0')]]
@@ -106,6 +107,16 @@ def test_parse_ns_headers(self):
             ]:
             self.assertEquals(parse_ns_headers([hdr]), expected)
 
+    def test_parse_ns_headers_version(self):
+
+        # quotes should be stripped
+        expected = [[('foo', 'bar'), ('version', '1')]]
+        for hdr in [
+            'foo=bar; version="1"',
+            'foo=bar; Version="1"',
+            ]:
+            self.assertEquals(parse_ns_headers([hdr]), expected)
+
     def test_parse_ns_headers_special_names(self):
         # names such as 'expires' are not special in first name=value pair
         # of Set-Cookie: header
@@ -1020,6 +1031,8 @@ def cookiejar_from_cookie_headers(headers):
             ["Set-Cookie2: a=foo; path=/; Version=1; domain"],
             # bad max-age
             ["Set-Cookie: b=foo; max-age=oops"],
+            # bad version
+            ["Set-Cookie: b=foo; version=spam"],
             ]:
             c = cookiejar_from_cookie_headers(headers)
             # these bad cookies shouldn't be set
 
@@ -159,12 +159,13 @@ enum_next(enumobject *en)
 }
 
 PyDoc_STRVAR(enum_doc,
-"enumerate(iterable) -> iterator for index, value of iterable\n"
+"enumerate(iterable[, start]) -> iterator for index, value of iterable\n"
 "\n"
 "Return an enumerate object.  iterable must be another object that supports\n"
 "iteration.  The enumerate object yields pairs containing a count (from\n"
-"zero) and a value yielded by the iterable argument.  enumerate is useful\n"
-"for obtaining an indexed list: (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
+"start, which defaults to zero) and a value yielded by the iterable argument.\n"
+"enumerate is useful for obtaining an indexed list:\n"
+"    (0, seq[0]), (1, seq[1]), (2, seq[2]), ...");
 
 PyTypeObject PyEnum_Type = {
     PyVarObject_HEAD_INIT(&PyType_Type, 0)
 
@@ -732,8 +732,9 @@ def visitModule(self, mod):
 {
     int i, result;
     PyObject *s, *l = PyTuple_New(num_fields);
-    if (!l) return 0;
-    for(i = 0; i < num_fields; i++) {
+    if (!l)
+        return 0;
+    for (i = 0; i < num_fields; i++) {
         s = PyUnicode_FromString(attrs[i]);
         if (!s) {
             Py_DECREF(l);
 
@@ -537,8 +537,9 @@ static int add_attributes(PyTypeObject* type, char**attrs, int num_fields)
 {
     int i, result;
     PyObject *s, *l = PyTuple_New(num_fields);
-    if (!l) return 0;
-    for(i = 0; i < num_fields; i++) {
+    if (!l)
+        return 0;
+    for (i = 0; i < num_fields; i++) {
         s = PyUnicode_FromString(attrs[i]);
         if (!s) {
             Py_DECREF(l);