diff --git a/Doc/distutils/apiref.rst b/Doc/distutils/apiref.rst
index cdb32d3..69ec0de 100644
--- a/Doc/distutils/apiref.rst
+++ b/Doc/distutils/apiref.rst
@@ -1952,7 +1952,7 @@
 
 
 The ``check`` command performs some tests on the meta-data of a package.
-It makes sure for example that all required meta-data are provided through
+For example, it verifies that all required meta-data are provided as
 the arguments passed to the :func:`setup` function.
 
 .. % todo
diff --git a/Doc/distutils/examples.rst b/Doc/distutils/examples.rst
index d5918a5..648063b 100644
--- a/Doc/distutils/examples.rst
+++ b/Doc/distutils/examples.rst
@@ -236,10 +236,10 @@
 Checking a package
 ==================
 
-The ``check`` command allows you to verify if your package meta-data are
-meeting the minimum requirements to build a distribution.
+The ``check`` command allows you to verify if your package meta-data
+meet the minimum requirements to build a distribution.
 
-To run it, just call it over your :file:`setup.py` script. If something is
+To run it, just call it using your :file:`setup.py` script. If something is
 missing, ``check`` will display a warning.
 
 Let's take an example with a simple script::
@@ -252,7 +252,7 @@
 
     $ python setup.py check
     running check
-    warning: check: missing required meta-data: version ,url
+    warning: check: missing required meta-data: version, url
     warning: check: missing meta-data: either (author and author_email) or
              (maintainer and maintainer_email) must be supplied
 
diff --git a/Doc/library/2to3.rst b/Doc/library/2to3.rst
index f37bb05..d9eb00c 100644
--- a/Doc/library/2to3.rst
+++ b/Doc/library/2to3.rst
@@ -86,6 +86,14 @@
 The :option:`-v` option enables output of more information on the translation
 process.
 
+Since some print statements can be parsed as function calls or statements, 2to3
+cannot always read files containing the print function.  When 2to3 detects the
+presence of the ``from __future__ import print_function`` compiler directive, it
+modifies its internal grammar to interpert :func:`print` as a function.  This
+change can also be enabled manually with the :option:`-p` flag.  Use
+:option:`-p` to run fixers on code that already has had its print statements
+converted.
+
 
 .. _2to3-fixers:
 
diff --git a/Doc/library/bdb.rst b/Doc/library/bdb.rst
index 3e5fcd6..d6d4ae2 100644
--- a/Doc/library/bdb.rst
+++ b/Doc/library/bdb.rst
@@ -62,14 +62,22 @@
       * The breakpoint hit count.
 
 
-.. class:: Bdb()
+.. class:: Bdb(skip=None)
 
-   The :class:`Bdb` acts as a generic Python debugger base class.
+   The :class:`Bdb` class acts as a generic Python debugger base class.
 
    This class takes care of the details of the trace facility; a derived class
    should implement user interaction.  The standard debugger class
    (:class:`pdb.Pdb`) is an example.
 
+   The *skip* argument, if given, must be an iterable of glob-style
+   module name patterns.  The debugger will not step into frames that
+   originate in a module that matches one of these patterns. Whether a
+   frame is considered to originate in a certain module is determined
+   by the ``__name__`` in the frame globals.
+
+   .. versionadded:: 2.7
+      The *skip* argument.
 
    The following methods of :class:`Bdb` normally don't need to be overridden.
 
diff --git a/Doc/library/io.rst b/Doc/library/io.rst
index 5188b51..8fb984e 100644
--- a/Doc/library/io.rst
+++ b/Doc/library/io.rst
@@ -98,8 +98,8 @@
 
    *buffering* is an optional integer used to set the buffering policy.  By
    default full buffering is on.  Pass 0 to switch buffering off (only allowed
-   in binary mode), 1 to set line buffering, and an integer > 1 for full
-   buffering.
+   in binary mode), 1 to set line buffering, and an integer > 1 to indicate the
+   size of the buffer.
 
    *encoding* is the name of the encoding used to decode or encode the file.
    This should only be used in text mode.  The default encoding is platform
diff --git a/Doc/library/operator.rst b/Doc/library/operator.rst
index 24ace8b..175314e 100644
--- a/Doc/library/operator.rst
+++ b/Doc/library/operator.rst
@@ -104,6 +104,14 @@
    Return ``a // b``.
 
 
+.. function:: index(a)
+              __index__(a)
+
+   Return *a* converted to an integer.  Equivalent to ``a.__index__()``.
+
+   .. versionadded:: 2.5
+
+
 .. function:: inv(obj)
               invert(obj)
               __inv__(obj)
@@ -133,7 +141,7 @@
 .. function:: neg(obj)
               __neg__(obj)
 
-   Return *obj* negated.
+   Return *obj* negated (``-obj``).
 
 
 .. function:: or_(a, b)
@@ -145,7 +153,7 @@
 .. function:: pos(obj)
               __pos__(obj)
 
-   Return *obj* positive.
+   Return *obj* positive (``+obj``).
 
 
 .. function:: pow(a, b)
@@ -179,13 +187,7 @@
    Return the bitwise exclusive or of *a* and *b*.
 
 
-.. function:: index(a)
-              __index__(a)
-
-   Return *a* converted to an integer.  Equivalent to ``a.__index__()``.
-
-
-Operations which work with sequences include:
+Operations which work with sequences (some of them with mappings too) include:
 
 .. function:: concat(a, b)
               __concat__(a, b)
@@ -394,67 +396,77 @@
 This table shows how abstract operations correspond to operator symbols in the
 Python syntax and the functions in the :mod:`operator` module.
 
-+-----------------------+-------------------------+---------------------------------+
-| Operation             | Syntax                  | Function                        |
-+=======================+=========================+=================================+
-| Addition              | ``a + b``               | ``add(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Concatenation         | ``seq1 + seq2``         | ``concat(seq1, seq2)``          |
-+-----------------------+-------------------------+---------------------------------+
-| Containment Test      | ``obj in seq``          | ``contains(seq, obj)``          |
-+-----------------------+-------------------------+---------------------------------+
-| Division              | ``a / b``               | ``truediv(a, b)``               |
-+-----------------------+-------------------------+---------------------------------+
-| Division              | ``a // b``              | ``floordiv(a, b)``              |
-+-----------------------+-------------------------+---------------------------------+
-| Bitwise And           | ``a & b``               | ``and_(a, b)``                  |
-+-----------------------+-------------------------+---------------------------------+
-| Bitwise Exclusive Or  | ``a ^ b``               | ``xor(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Bitwise Inversion     | ``~ a``                 | ``invert(a)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Bitwise Or            | ``a | b``               | ``or_(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Exponentiation        | ``a ** b``              | ``pow(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Identity              | ``a is b``              | ``is_(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Identity              | ``a is not b``          | ``is_not(a, b)``                |
-+-----------------------+-------------------------+---------------------------------+
-| Indexed Assignment    | ``obj[k] = v``          | ``setitem(obj, k, v)``          |
-+-----------------------+-------------------------+---------------------------------+
-| Indexed Deletion      | ``del obj[k]``          | ``delitem(obj, k)``             |
-+-----------------------+-------------------------+---------------------------------+
-| Indexing              | ``obj[k]``              | ``getitem(obj, k)``             |
-+-----------------------+-------------------------+---------------------------------+
-| Left Shift            | ``a << b``              | ``lshift(a, b)``                |
-+-----------------------+-------------------------+---------------------------------+
-| Modulo                | ``a % b``               | ``mod(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Multiplication        | ``a * b``               | ``mul(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Negation (Arithmetic) | ``- a``                 | ``neg(a)``                      |
-+-----------------------+-------------------------+---------------------------------+
-| Negation (Logical)    | ``not a``               | ``not_(a)``                     |
-+-----------------------+-------------------------+---------------------------------+
-| Right Shift           | ``a >> b``              | ``rshift(a, b)``                |
-+-----------------------+-------------------------+---------------------------------+
-| String Formatting     | ``s % obj``             | ``mod(s, obj)``                 |
-+-----------------------+-------------------------+---------------------------------+
-| Subtraction           | ``a - b``               | ``sub(a, b)``                   |
-+-----------------------+-------------------------+---------------------------------+
-| Truth Test            | ``obj``                 | ``truth(obj)``                  |
-+-----------------------+-------------------------+---------------------------------+
-| Ordering              | ``a < b``               | ``lt(a, b)``                    |
-+-----------------------+-------------------------+---------------------------------+
-| Ordering              | ``a <= b``              | ``le(a, b)``                    |
-+-----------------------+-------------------------+---------------------------------+
-| Equality              | ``a == b``              | ``eq(a, b)``                    |
-+-----------------------+-------------------------+---------------------------------+
-| Difference            | ``a != b``              | ``ne(a, b)``                    |
-+-----------------------+-------------------------+---------------------------------+
-| Ordering              | ``a >= b``              | ``ge(a, b)``                    |
-+-----------------------+-------------------------+---------------------------------+
-| Ordering              | ``a > b``               | ``gt(a, b)``                    |
-+-----------------------+-------------------------+---------------------------------+
++-----------------------+-------------------------+---------------------------------------+
+| Operation             | Syntax                  | Function                              |
++=======================+=========================+=======================================+
+| Addition              | ``a + b``               | ``add(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Concatenation         | ``seq1 + seq2``         | ``concat(seq1, seq2)``                |
++-----------------------+-------------------------+---------------------------------------+
+| Containment Test      | ``obj in seq``          | ``contains(seq, obj)``                |
++-----------------------+-------------------------+---------------------------------------+
+| Division              | ``a / b``               | ``div(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Division              | ``a // b``              | ``floordiv(a, b)``                    |
++-----------------------+-------------------------+---------------------------------------+
+| Bitwise And           | ``a & b``               | ``and_(a, b)``                        |
++-----------------------+-------------------------+---------------------------------------+
+| Bitwise Exclusive Or  | ``a ^ b``               | ``xor(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Bitwise Inversion     | ``~ a``                 | ``invert(a)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Bitwise Or            | ``a | b``               | ``or_(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Exponentiation        | ``a ** b``              | ``pow(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Identity              | ``a is b``              | ``is_(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Identity              | ``a is not b``          | ``is_not(a, b)``                      |
++-----------------------+-------------------------+---------------------------------------+
+| Indexed Assignment    | ``obj[k] = v``          | ``setitem(obj, k, v)``                |
++-----------------------+-------------------------+---------------------------------------+
+| Indexed Deletion      | ``del obj[k]``          | ``delitem(obj, k)``                   |
++-----------------------+-------------------------+---------------------------------------+
+| Indexing              | ``obj[k]``              | ``getitem(obj, k)``                   |
++-----------------------+-------------------------+---------------------------------------+
+| Left Shift            | ``a << b``              | ``lshift(a, b)``                      |
++-----------------------+-------------------------+---------------------------------------+
+| Modulo                | ``a % b``               | ``mod(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Multiplication        | ``a * b``               | ``mul(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Negation (Arithmetic) | ``- a``                 | ``neg(a)``                            |
++-----------------------+-------------------------+---------------------------------------+
+| Negation (Logical)    | ``not a``               | ``not_(a)``                           |
++-----------------------+-------------------------+---------------------------------------+
+| Positive              | ``+ a``                 | ``pos(a)``                            |
++-----------------------+-------------------------+---------------------------------------+
+| Right Shift           | ``a >> b``              | ``rshift(a, b)``                      |
++-----------------------+-------------------------+---------------------------------------+
+| Sequence Repetition   | ``seq * i``             | ``repeat(seq, i)``                    |
++-----------------------+-------------------------+---------------------------------------+
+| Slice Assignment      | ``seq[i:j] = values``   | ``setitem(seq, slice(i, j), values)`` |
++-----------------------+-------------------------+---------------------------------------+
+| Slice Deletion        | ``del seq[i:j]``        | ``delitem(seq, slice(i, j))``         |
++-----------------------+-------------------------+---------------------------------------+
+| Slicing               | ``seq[i:j]``            | ``getitem(seq, slice(i, j))``         |
++-----------------------+-------------------------+---------------------------------------+
+| String Formatting     | ``s % obj``             | ``mod(s, obj)``                       |
++-----------------------+-------------------------+---------------------------------------+
+| Subtraction           | ``a - b``               | ``sub(a, b)``                         |
++-----------------------+-------------------------+---------------------------------------+
+| Truth Test            | ``obj``                 | ``truth(obj)``                        |
++-----------------------+-------------------------+---------------------------------------+
+| Ordering              | ``a < b``               | ``lt(a, b)``                          |
++-----------------------+-------------------------+---------------------------------------+
+| Ordering              | ``a <= b``              | ``le(a, b)``                          |
++-----------------------+-------------------------+---------------------------------------+
+| Equality              | ``a == b``              | ``eq(a, b)``                          |
++-----------------------+-------------------------+---------------------------------------+
+| Difference            | ``a != b``              | ``ne(a, b)``                          |
++-----------------------+-------------------------+---------------------------------------+
+| Ordering              | ``a >= b``              | ``ge(a, b)``                          |
++-----------------------+-------------------------+---------------------------------------+
+| Ordering              | ``a > b``               | ``gt(a, b)``                          |
++-----------------------+-------------------------+---------------------------------------+
 
diff --git a/Doc/library/pdb.rst b/Doc/library/pdb.rst
index 96b524d..9a0c00e 100644
--- a/Doc/library/pdb.rst
+++ b/Doc/library/pdb.rst
@@ -55,7 +55,7 @@
    import pdb; pdb.set_trace()
 
 at the location you want to break into the debugger.  You can then step through
-the code following this statement, and continue running without debugger using
+the code following this statement, and continue running without the debugger using
 the ``c`` command.
 
 The typical usage to inspect a crashed program is::
diff --git a/Doc/library/profile.rst b/Doc/library/profile.rst
index e465b56..f7df0b5 100644
--- a/Doc/library/profile.rst
+++ b/Doc/library/profile.rst
@@ -6,6 +6,8 @@
 
 .. sectionauthor:: James Roskind
 
+.. module:: profile
+   :synopsis: Python source profiler.
 
 .. index:: single: InfoSeek Corporation
 
diff --git a/Doc/library/pty.rst b/Doc/library/pty.rst
index ac965ff..d039fdf 100644
--- a/Doc/library/pty.rst
+++ b/Doc/library/pty.rst
@@ -2,8 +2,8 @@
 ========================================
 
 .. module:: pty
-   :platform: IRIX, Linux
-   :synopsis: Pseudo-Terminal Handling for SGI and Linux.
+   :platform: Linux
+   :synopsis: Pseudo-Terminal Handling for Linux.
 .. moduleauthor:: Steen Lumholt
 .. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
 
@@ -13,8 +13,8 @@
 controlling terminal programmatically.
 
 Because pseudo-terminal handling is highly platform dependent, there is code to
-do it only for SGI and Linux. (The Linux code is supposed to work on other
-platforms, but hasn't been tested yet.)
+do it only for Linux. (The Linux code is supposed to work on other platforms,
+but hasn't been tested yet.)
 
 The :mod:`pty` module defines the following functions:
 
@@ -31,8 +31,8 @@
 .. function:: openpty()
 
    Open a new pseudo-terminal pair, using :func:`os.openpty` if possible, or
-   emulation code for SGI and generic Unix systems. Return a pair of file
-   descriptors ``(master, slave)``, for the master and the slave end, respectively.
+   emulation code for generic Unix systems. Return a pair of file descriptors
+   ``(master, slave)``, for the master and the slave end, respectively.
 
 
 .. function:: spawn(argv[, master_read[, stdin_read]])
diff --git a/Doc/library/tarfile.rst b/Doc/library/tarfile.rst
index 1f53037..4d0a995 100644
--- a/Doc/library/tarfile.rst
+++ b/Doc/library/tarfile.rst
@@ -365,7 +365,7 @@
    value. Depending on this value the respective file is either excluded
    (:const:`True`) or added (:const:`False`). If *filter* is specified it must
    be a function that takes a :class:`TarInfo` object argument and returns the
-   changed TarInfo object. If it instead returns :const:`None` the TarInfo
+   changed :class:`TarInfo` object. If it instead returns :const:`None` the :class:`TarInfo`
    object will be excluded from the archive. See :ref:`tar-examples` for an
    example.
 
diff --git a/Doc/library/turtle.rst b/Doc/library/turtle.rst
index d70550a..d947186 100644
--- a/Doc/library/turtle.rst
+++ b/Doc/library/turtle.rst
@@ -2023,7 +2023,7 @@
    Subclass of TurtleScreen, with :ref:`four methods added <screenspecific>`.
 
 
-.. class:: ScrolledCavas(master)
+.. class:: ScrolledCanvas(master)
 
    :param master: some Tkinter widget to contain the ScrolledCanvas, i.e.
       a Tkinter-canvas with scrollbars added
diff --git a/Doc/library/weakref.rst b/Doc/library/weakref.rst
index 685d207..2aa49e3 100644
--- a/Doc/library/weakref.rst
+++ b/Doc/library/weakref.rst
@@ -72,10 +72,9 @@
 
    obj = Dict(red=1, green=2, blue=3)   # this object is weak referenceable
 
-.. impl-detail::
-
-   Other built-in types such as :class:`tuple` and :class:`long` do not support
-   weak references even when subclassed.
+Other built-in types such as :class:`tuple` and :class:`long` do not support
+weak references even when subclassed (This is an implementation detail and may
+be different across various Python implementations.).
 
 Extension types can easily be made to support weak references; see
 :ref:`weakref-support`.
diff --git a/Doc/library/zipfile.rst b/Doc/library/zipfile.rst
index a7fb842..ae8751e 100644
--- a/Doc/library/zipfile.rst
+++ b/Doc/library/zipfile.rst
@@ -197,6 +197,13 @@
    be a subset of the list returned by :meth:`namelist`.  *pwd* is the password
    used for encrypted files.
 
+   .. warning::
+
+      Never extract archives from untrusted sources without prior inspection.
+      It is possible that files are created outside of *path*, e.g. members
+      that have absolute filenames starting with ``"/"`` or filenames with two
+      dots ``".."``.
+
 
 .. method:: ZipFile.printdir()
 
diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst
index 27d8e5c..8b71153 100644
--- a/Doc/whatsnew/2.6.rst
+++ b/Doc/whatsnew/2.6.rst
@@ -2416,9 +2416,13 @@
   environments.  TIPC addresses are 4- or 5-tuples.
   (Contributed by Alberto Bertogli; :issue:`1646`.)
 
-  A new function, :func:`create_connection`, takes an address
-  and connects to it using an optional timeout value, returning
-  the connected socket object.
+  A new function, :func:`create_connection`, takes an address and
+  connects to it using an optional timeout value, returning the
+  connected socket object.  This function also looks up the address's
+  type and connects to it using IPv4 or IPv6 as appropriate.  Changing
+  your code to use :func:`create_connection` instead of
+  ``socket(socket.AF_INET, ...)`` may be all that's required to make
+  your code work with IPv6.
 
 * The base classes in the :mod:`SocketServer` module now support
   calling a :meth:`handle_timeout` method after a span of inactivity
diff --git a/Lib/distutils/command/check.py b/Lib/distutils/command/check.py
index 9a8fca1..12844cb 100644
--- a/Lib/distutils/command/check.py
+++ b/Lib/distutils/command/check.py
@@ -92,7 +92,7 @@
                 missing.append(attr)
 
         if missing:
-            self.warn("missing required meta-data: %s"  % ' ,'.join(missing))
+            self.warn("missing required meta-data: %s"  % ', '.join(missing))
         if metadata.author:
             if not metadata.author_email:
                 self.warn("missing meta-data: if 'author' supplied, " +
diff --git a/Lib/inspect.py b/Lib/inspect.py
index 1f1b7f9..c489502 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -238,7 +238,7 @@
 
 def isabstract(object):
     """Return true if the object is an abstract base class (ABC)."""
-    return isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT
+    return bool(isinstance(object, type) and object.__flags__ & TPFLAGS_IS_ABSTRACT)
 
 def getmembers(object, predicate=None):
     """Return all members of an object as (name, value) pairs sorted by name.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 75a74fa..9fb0692 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -193,6 +193,14 @@
         newsoft = min(hard, max(soft, 1024*2048))
         resource.setrlimit(resource.RLIMIT_STACK, (newsoft, hard))
 
+# Test result constants.
+PASSED = 1
+FAILED = 0
+ENV_CHANGED = -1
+SKIPPED = -2
+RESOURCE_DENIED = -3
+INTERRUPTED = -4
+
 from test import support
 
 RESOURCE_NAMES = ('audio', 'curses', 'largefile', 'network',
@@ -352,7 +360,7 @@
             try:
                 result = runtest(*args, **kwargs)
             except BaseException as e:
-                result = -4, e.__class__.__name__
+                result = INTERRUPTED, e.__class__.__name__
             sys.stdout.flush()
             print()   # Force a newline (just in case)
             print(json.dumps(result))
@@ -443,19 +451,18 @@
     def accumulate_result(test, result):
         ok, test_time = result
         test_times.append((test_time, test))
-        if ok > 0:
+        if ok == PASSED:
             good.append(test)
-            return 'good'
-        elif -2 < ok <= 0:
+        elif ok == FAILED:
             bad.append(test)
-            if ok == -1:
-                environment_changed.append(test)
-            return 'bad'
-        else:
+        elif ok == ENV_CHANGED:
+            bad.append(test)
+            environment_changed.append(test)
+        elif ok == SKIPPED:
             skipped.append(test)
-            if ok == -3:
-                resource_denieds.append(test)
-            return 'skipped'
+        elif ok == RESOURCE_DENIED:
+            skipped.append(test)
+            resource_denieds.append(test)
 
     if use_mp:
         from threading import Thread
@@ -511,7 +518,7 @@
                 print(stdout)
             if stderr:
                 print(stderr, file=sys.stderr)
-            if result[0] == -4:
+            if result[0] == INTERRUPTED:
                 assert result[1] == 'KeyboardInterrupt'
                 pending.clear()
                 raise KeyboardInterrupt   # What else?
@@ -532,8 +539,8 @@
                 try:
                     result = runtest(test, verbose, quiet,
                                      testdir, huntrleaks, debug)
-                    which = accumulate_result(test, result)
-                    if verbose3 and which == 'bad':
+                    accumulate_result(test, result)
+                    if verbose3 and result[0] == FAILED:
                         print("Re-running test {} in verbose mode".format(test))
                         runtest(test, True, quiet, testdir, huntrleaks, debug)
                 except KeyboardInterrupt:
@@ -679,15 +686,14 @@
     testdir -- test directory
     huntrleaks -- run multiple times to test for leaks; requires a debug
                   build; a triple corresponding to -R's three arguments
-    debug -- if true, print tracebacks for failed tests regardless of
-             verbose setting
-    Return:
-        -4  KeyboardInterrupt when run under -j
-        -3  test skipped because resource denied
-        -2  test skipped for some other reason
-        -1  test failed because it changed the execution environment
-         0  test failed
-         1  test passed
+
+    Returns one of the test result constants:
+        INTERRUPTED      KeyboardInterrupt when run under -j
+        RESOURCE_DENIED  test skipped because resource denied
+        SKIPPED          test skipped for some other reason
+        ENV_CHANGED      test failed because it changed the execution environment
+        FAILED           test failed
+        PASSED           test passed
     """
 
     support.verbose = verbose  # Tell tests to be moderately quiet
@@ -843,18 +849,18 @@
         if not quiet:
             print(test, "skipped --", msg)
             sys.stdout.flush()
-        return -3, test_time
+        return RESOURCE_DENIED, test_time
     except unittest.SkipTest as msg:
         if not quiet:
             print(test, "skipped --", msg)
             sys.stdout.flush()
-        return -2, test_time
+        return SKIPPED, test_time
     except KeyboardInterrupt:
         raise
     except support.TestFailed as msg:
         print("test", test, "failed --", msg)
         sys.stdout.flush()
-        return 0, test_time
+        return FAILED, test_time
     except:
         type, value = sys.exc_info()[:2]
         print("test", test, "crashed --", str(type) + ":", value)
@@ -862,13 +868,13 @@
         if verbose or debug:
             traceback.print_exc(file=sys.stdout)
             sys.stdout.flush()
-        return 0, test_time
+        return FAILED, test_time
     else:
         if refleak:
-            return 0, test_time
+            return FAILED, test_time
         if environment.changed:
-            return -1, test_time
-        return 1, test_time
+            return ENV_CHANGED, test_time
+        return PASSED, test_time
 
 def cleanup_test_droppings(testname, verbose):
     import shutil
diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 0a832c4..07697ac 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -154,6 +154,14 @@
         im = ast.parse("from . import y").body[0]
         self.assertIsNone(im.module)
 
+    def test_base_classes(self):
+        self.assertTrue(issubclass(ast.For, ast.stmt))
+        self.assertTrue(issubclass(ast.Name, ast.expr))
+        self.assertTrue(issubclass(ast.stmt, ast.AST))
+        self.assertTrue(issubclass(ast.expr, ast.AST))
+        self.assertTrue(issubclass(ast.comprehension, ast.AST))
+        self.assertTrue(issubclass(ast.Gt, ast.AST))
+
     def test_nodeclasses(self):
         x = ast.BinOp(1, 2, 3, lineno=0)
         self.assertEquals(x.left, 1)
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index c1df23e..9dba30d 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -120,6 +120,28 @@
         self.assertTrue('a' in members)
         self.assertTrue('b' not in members)
 
+    def test_isabstract(self):
+        from abc import ABCMeta, abstractmethod
+
+        class AbstractClassExample(metaclass=ABCMeta):
+
+            @abstractmethod
+            def foo(self):
+                pass
+
+        class ClassExample(AbstractClassExample):
+            def foo(self):
+                pass
+
+        a = ClassExample()
+
+        # Test general behaviour.
+        self.assertTrue(inspect.isabstract(AbstractClassExample))
+        self.assertFalse(inspect.isabstract(ClassExample))
+        self.assertFalse(inspect.isabstract(a))
+        self.assertFalse(inspect.isabstract(int))
+        self.assertFalse(inspect.isabstract(5))
+
 
 class TestInterpreterStack(IsTestBase):
     def __init__(self, *args, **kwargs):
diff --git a/Lib/test/test_module.py b/Lib/test/test_module.py
index 0e56290..21ddc9a 100644
--- a/Lib/test/test_module.py
+++ b/Lib/test/test_module.py
@@ -55,6 +55,14 @@
               {"__name__": "foo", "__doc__": "foodoc", "bar": 42})
         self.assertTrue(foo.__dict__ is d)
 
+    def test_dont_clear_dict(self):
+        # See issue 7140.
+        def f():
+            foo = ModuleType("foo")
+            foo.bar = 4
+            return foo
+        self.assertEqual(f().__dict__["bar"], 4)
+
 def test_main():
     run_unittest(ModuleTests)
 
diff --git a/Lib/test/test_strptime.py b/Lib/test/test_strptime.py
index fb60ee4..9008717 100644
--- a/Lib/test/test_strptime.py
+++ b/Lib/test/test_strptime.py
@@ -493,9 +493,9 @@
         _strptime._strptime_time("10", "%d")
         _strptime._strptime_time("2005", "%Y")
         _strptime._TimeRE_cache.locale_time.lang = "Ni"
-        original_time_re = id(_strptime._TimeRE_cache)
+        original_time_re = _strptime._TimeRE_cache
         _strptime._strptime_time("10", "%d")
-        self.assertNotEqual(original_time_re, id(_strptime._TimeRE_cache))
+        self.assertIsNot(original_time_re, _strptime._TimeRE_cache)
         self.assertEqual(len(_strptime._regex_cache), 1)
 
     def test_regex_cleanup(self):
@@ -514,11 +514,10 @@
     def test_new_localetime(self):
         # A new LocaleTime instance should be created when a new TimeRE object
         # is created.
-        locale_time_id = id(_strptime._TimeRE_cache.locale_time)
+        locale_time_id = _strptime._TimeRE_cache.locale_time
         _strptime._TimeRE_cache.locale_time.lang = "Ni"
         _strptime._strptime_time("10", "%d")
-        self.assertNotEqual(locale_time_id,
-                         id(_strptime._TimeRE_cache.locale_time))
+        self.assertIsNot(locale_time_id, _strptime._TimeRE_cache.locale_time)
 
     def test_TimeRE_recreation(self):
         # The TimeRE instance should be recreated upon changing the locale.
@@ -530,15 +529,15 @@
         try:
             _strptime._strptime_time('10', '%d')
             # Get id of current cache object.
-            first_time_re_id = id(_strptime._TimeRE_cache)
+            first_time_re = _strptime._TimeRE_cache
             try:
                 # Change the locale and force a recreation of the cache.
                 locale.setlocale(locale.LC_TIME, ('de_DE', 'UTF8'))
                 _strptime._strptime_time('10', '%d')
                 # Get the new cache object's id.
-                second_time_re_id = id(_strptime._TimeRE_cache)
+                second_time_re = _strptime._TimeRE_cache
                 # They should not be equal.
-                self.assertNotEqual(first_time_re_id, second_time_re_id)
+                self.assertIsNot(first_time_re, second_time_re)
             # Possible test locale is not supported while initial locale is.
             # If this is the case just suppress the exception and fall-through
             # to the reseting to the original locale.
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 330a2c5..c5d8d79 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -185,11 +185,13 @@
         except AsyncExc:
             pass
         else:
+            # This code is unreachable but it reflects the intent. If we wanted
+            # to be smarter the above loop wouldn't be infinite.
             self.fail("AsyncExc not raised")
         try:
             self.assertEqual(result, 1) # one thread state modified
         except UnboundLocalError:
-            # The exception was raised to quickly for us to get the result.
+            # The exception was raised too quickly for us to get the result.
             pass
 
         # `worker_started` is set by the thread when it's inside a try/except
diff --git a/Lib/test/test_tokenize.py b/Lib/test/test_tokenize.py
index ba705ba..7b91ab2 100644
--- a/Lib/test/test_tokenize.py
+++ b/Lib/test/test_tokenize.py
@@ -531,6 +531,24 @@
     ...         break
     ... else: True
     True
+
+Evil tabs
+    >>> dump_tokens("def f():\\n\\tif x\\n        \\tpass")
+    ENCODING   'utf-8'       (0, 0) (0, 0)
+    NAME       'def'         (1, 0) (1, 3)
+    NAME       'f'           (1, 4) (1, 5)
+    OP         '('           (1, 5) (1, 6)
+    OP         ')'           (1, 6) (1, 7)
+    OP         ':'           (1, 7) (1, 8)
+    NEWLINE    '\\n'          (1, 8) (1, 9)
+    INDENT     '\\t'          (2, 0) (2, 1)
+    NAME       'if'          (2, 1) (2, 3)
+    NAME       'x'           (2, 4) (2, 5)
+    NEWLINE    '\\n'          (2, 5) (2, 6)
+    INDENT     '        \\t'  (3, 0) (3, 9)
+    NAME       'pass'        (3, 9) (3, 13)
+    DEDENT     ''            (4, 0) (4, 0)
+    DEDENT     ''            (4, 0) (4, 0)
 """
 
 from test import support
diff --git a/Lib/tokenize.py b/Lib/tokenize.py
index fb58c6b..9d2a6bb 100644
--- a/Lib/tokenize.py
+++ b/Lib/tokenize.py
@@ -23,15 +23,15 @@
 __credits__ = ('GvR, ESR, Tim Peters, Thomas Wouters, Fred Drake, '
                'Skip Montanaro, Raymond Hettinger, Trent Nelson, '
                'Michael Foord')
-
 import re, string, sys
 from token import *
 from codecs import lookup, BOM_UTF8
 cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
 
 import token
-__all__ = [x for x in dir(token) if x[0] != '_'] + ["COMMENT", "tokenize",
-           "detect_encoding", "NL", "untokenize", "ENCODING", "TokenInfo"]
+__all__ = [x for x in dir(token) if not x.startswith("_")]
+__all__.extend(["COMMENT", "tokenize", "detect_encoding", "NL", "untokenize",
+                "ENCODING", "TokenInfo"])
 del token
 
 COMMENT = N_TOKENS
@@ -407,7 +407,7 @@
 
         if encoding is not None:
             line = line.decode(encoding)
-        lnum = lnum + 1
+        lnum += 1
         pos, max = 0, len(line)
 
         if contstr:                            # continued string
@@ -435,12 +435,17 @@
             if not line: break
             column = 0
             while pos < max:                   # measure leading whitespace
-                if line[pos] == ' ': column = column + 1
-                elif line[pos] == '\t': column = (column/tabsize + 1)*tabsize
-                elif line[pos] == '\f': column = 0
-                else: break
-                pos = pos + 1
-            if pos == max: break
+                if line[pos] == ' ':
+                    column += 1
+                elif line[pos] == '\t':
+                    column = (column//tabsize + 1)*tabsize
+                elif line[pos] == '\f':
+                    column = 0
+                else:
+                    break
+                pos += 1
+            if pos == max:
+                break
 
             if line[pos] in '#\r\n':           # skip comments or blank lines
                 if line[pos] == '#':
@@ -516,13 +521,15 @@
                 elif initial == '\\':                      # continued stmt
                     continued = 1
                 else:
-                    if initial in '([{': parenlev = parenlev + 1
-                    elif initial in ')]}': parenlev = parenlev - 1
+                    if initial in '([{':
+                        parenlev += 1
+                    elif initial in ')]}':
+                        parenlev -= 1
                     yield TokenInfo(OP, token, spos, epos, line)
             else:
                 yield TokenInfo(ERRORTOKEN, line[pos],
                            (lnum, pos), (lnum, pos+1), line)
-                pos = pos + 1
+                pos += 1
 
     for indent in indents[1:]:                 # pop remaining indent levels
         yield TokenInfo(DEDENT, '', (lnum, 0), (lnum, 0), '')
diff --git a/Lib/xml/__init__.py b/Lib/xml/__init__.py
index fa5e8cd..deed983 100644
--- a/Lib/xml/__init__.py
+++ b/Lib/xml/__init__.py
@@ -19,12 +19,6 @@
 
 __all__ = ["dom", "parsers", "sax", "etree"]
 
-# When being checked-out without options, this has the form
-# "<dollar>Revision: x.y </dollar>"
-# When exported using -kv, it is "x.y".
-__version__ = "$Revision$".split()[-2:][0]
-
-
 _MINIMUM_XMLPLUS_VERSION = (0, 8, 4)
 
 
diff --git a/Misc/Porting b/Misc/Porting
index 1b94f14..ec9cf1f 100644
--- a/Misc/Porting
+++ b/Misc/Porting
@@ -31,8 +31,7 @@
 it out of the config.c file.
 
 Bang on it until you get a >>> prompt.  (You may have to disable the
-importing of "site.py" and "exceptions.py" by passing -X and -S
-options.
+importing of "site.py" by passing the -S options.)
 
 Then bang on it until it executes very simple Python statements.
 
diff --git a/Modules/_io/stringio.c b/Modules/_io/stringio.c
index ad9730d..c19c4c0 100644
--- a/Modules/_io/stringio.c
+++ b/Modules/_io/stringio.c
@@ -600,9 +600,6 @@
     assert((newline != NULL && newline_obj != Py_None) ||
            (newline == NULL && newline_obj == Py_None));
 
-    assert((newline != NULL && newline_obj != Py_None) ||
-           (newline == NULL && newline_obj == Py_None));
-
     if (newline) {
         self->readnl = PyUnicode_FromString(newline);
         if (self->readnl == NULL)
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index 249c227..052fca1 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -661,7 +661,7 @@
 	     "This is the smallest integral value >= x.");
 
 FUNC2(copysign, copysign,
-      "copysign(x,y)\n\nReturn x with the sign of y.")
+      "copysign(x, y)\n\nReturn x with the sign of y.")
 FUNC1(cos, cos, 0,
       "cos(x)\n\nReturn the cosine of x (measured in radians).")
 FUNC1(cosh, cosh, 1,
@@ -695,8 +695,8 @@
 FUNC1A(gamma, m_tgamma,
       "gamma(x)\n\nGamma function at x.")
 FUNC1(log1p, log1p, 1,
-      "log1p(x)\n\nReturn the natural logarithm of 1+x (base e).\n\
-      The result is computed in a way which is accurate for x near zero.")
+      "log1p(x)\n\nReturn the natural logarithm of 1+x (base e).\n"
+      "The result is computed in a way which is accurate for x near zero.")
 FUNC1(sin, sin, 0,
       "sin(x)\n\nReturn the sine of x (measured in radians).")
 FUNC1(sinh, sinh, 1,
@@ -925,7 +925,7 @@
 #undef NUM_PARTIALS
 
 PyDoc_STRVAR(math_fsum_doc,
-"sum(iterable)\n\n\
+"fsum(iterable)\n\n\
 Return an accurate floating point sum of values in the iterable.\n\
 Assumes IEEE-754 floating point arithmetic.");
 
@@ -1101,7 +1101,8 @@
 }
 
 PyDoc_STRVAR(math_ldexp_doc,
-"ldexp(x, i) -> x * (2**i)");
+"ldexp(x, i)\n\n\
+Return x * (2**i).");
 
 static PyObject *
 math_modf(PyObject *self, PyObject *arg)
@@ -1192,7 +1193,8 @@
 }
 
 PyDoc_STRVAR(math_log_doc,
-"log(x[, base]) -> the logarithm of x to the given base.\n\
+"log(x[, base])\n\n\
+Return the logarithm of x to the given base.\n\
 If the base not specified, returns the natural logarithm (base e) of x.");
 
 static PyObject *
@@ -1202,7 +1204,7 @@
 }
 
 PyDoc_STRVAR(math_log10_doc,
-"log10(x) -> the base 10 logarithm of x.");
+"log10(x)\n\nReturn the base 10 logarithm of x.");
 
 static PyObject *
 math_fmod(PyObject *self, PyObject *args)
@@ -1235,7 +1237,7 @@
 }
 
 PyDoc_STRVAR(math_fmod_doc,
-"fmod(x,y)\n\nReturn fmod(x, y), according to platform C."
+"fmod(x, y)\n\nReturn fmod(x, y), according to platform C."
 "  x % y may differ.");
 
 static PyObject *
@@ -1277,7 +1279,7 @@
 }
 
 PyDoc_STRVAR(math_hypot_doc,
-"hypot(x,y)\n\nReturn the Euclidean distance, sqrt(x*x + y*y).");
+"hypot(x, y)\n\nReturn the Euclidean distance, sqrt(x*x + y*y).");
 
 /* pow can't use math_2, but needs its own wrapper: the problem is
    that an infinite result can arise either as a result of overflow
@@ -1364,7 +1366,7 @@
 }
 
 PyDoc_STRVAR(math_pow_doc,
-"pow(x,y)\n\nReturn x**y (x to the power of y).");
+"pow(x, y)\n\nReturn x**y (x to the power of y).");
 
 static const double degToRad = Py_MATH_PI / 180.0;
 static const double radToDeg = 180.0 / Py_MATH_PI;
@@ -1379,7 +1381,8 @@
 }
 
 PyDoc_STRVAR(math_degrees_doc,
-"degrees(x) -> converts angle x from radians to degrees");
+"degrees(x)\n\n\
+Convert angle x from radians to degrees.");
 
 static PyObject *
 math_radians(PyObject *self, PyObject *arg)
@@ -1391,7 +1394,8 @@
 }
 
 PyDoc_STRVAR(math_radians_doc,
-"radians(x) -> converts angle x from degrees to radians");
+"radians(x)\n\n\
+Convert angle x from degrees to radians.");
 
 static PyObject *
 math_isnan(PyObject *self, PyObject *arg)
@@ -1403,8 +1407,8 @@
 }
 
 PyDoc_STRVAR(math_isnan_doc,
-"isnan(x) -> bool\n\
-Checks if float x is not a number (NaN)");
+"isnan(x) -> bool\n\n\
+Check if float x is not a number (NaN).");
 
 static PyObject *
 math_isinf(PyObject *self, PyObject *arg)
@@ -1416,8 +1420,8 @@
 }
 
 PyDoc_STRVAR(math_isinf_doc,
-"isinf(x) -> bool\n\
-Checks if float x is infinite (positive or negative)");
+"isinf(x) -> bool\n\n\
+Check if float x is infinite (positive or negative).");
 
 static PyMethodDef math_methods[] = {
 	{"acos",	math_acos,	METH_O,		math_acos_doc},
diff --git a/Modules/operator.c b/Modules/operator.c
index 0ba8b09..85d662d 100644
--- a/Modules/operator.c
+++ b/Modules/operator.c
@@ -7,7 +7,7 @@
 This module exports a set of functions implemented in C corresponding\n\
 to the intrinsic operators of Python.  For example, operator.add(x, y)\n\
 is equivalent to the expression x+y.  The function names are those\n\
-used for special class methods; variants without leading and trailing\n\
+used for special methods; variants without leading and trailing\n\
 '__' are also provided for convenience.");
 
 #define spam1(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
@@ -197,21 +197,21 @@
 spam2(and_,__and__, "and_(a, b) -- Same as a & b.")
 spam2(xor,__xor__, "xor(a, b) -- Same as a ^ b.")
 spam2(or_,__or__, "or_(a, b) -- Same as a | b.")
-spam2(iadd,__iadd__, "iadd(a, b) -- Same as a += b.")
-spam2(isub,__isub__, "isub(a, b) -- Same as a -= b.")
-spam2(imul,__imul__, "imul(a, b) -- Same as a *= b.")
-spam2(ifloordiv,__ifloordiv__, "ifloordiv(a, b) -- Same as a //= b.")
-spam2(itruediv,__itruediv__, "itruediv(a, b) -- Same as a /= b.")
-spam2(imod,__imod__, "imod(a, b) -- Same as a %= b.")
-spam2(ilshift,__ilshift__, "ilshift(a, b) -- Same as a <<= b.")
-spam2(irshift,__irshift__, "irshift(a, b) -- Same as a >>= b.")
-spam2(iand,__iand__, "iand(a, b) -- Same as a &= b.")
-spam2(ixor,__ixor__, "ixor(a, b) -- Same as a ^= b.")
-spam2(ior,__ior__, "ior(a, b) -- Same as a |= b.")
+spam2(iadd,__iadd__, "a = iadd(a, b) -- Same as a += b.")
+spam2(isub,__isub__, "a = isub(a, b) -- Same as a -= b.")
+spam2(imul,__imul__, "a = imul(a, b) -- Same as a *= b.")
+spam2(ifloordiv,__ifloordiv__, "a = ifloordiv(a, b) -- Same as a //= b.")
+spam2(itruediv,__itruediv__, "a = itruediv(a, b) -- Same as a /= b")
+spam2(imod,__imod__, "a = imod(a, b) -- Same as a %= b.")
+spam2(ilshift,__ilshift__, "a = ilshift(a, b) -- Same as a <<= b.")
+spam2(irshift,__irshift__, "a = irshift(a, b) -- Same as a >>= b.")
+spam2(iand,__iand__, "a = iand(a, b) -- Same as a &= b.")
+spam2(ixor,__ixor__, "a = ixor(a, b) -- Same as a ^= b.")
+spam2(ior,__ior__, "a = ior(a, b) -- Same as a |= b.")
 spam2(concat,__concat__,
  "concat(a, b) -- Same as a + b, for a and b sequences.")
 spam2(iconcat,__iconcat__,
- "iconcat(a, b) -- Same as a += b, for a and b sequences.")
+ "a = iconcat(a, b) -- Same as a += b, for a and b sequences.")
 spam2(getitem,__getitem__,
  "getitem(a, b) -- Same as a[b].")
 spam2(setitem,__setitem__,
@@ -219,7 +219,7 @@
 spam2(delitem,__delitem__,
  "delitem(a, b) -- Same as del a[b].")
 spam2(pow,__pow__, "pow(a, b) -- Same as a ** b.")
-spam2(ipow,__ipow__, "ipow(a, b) -- Same as a **= b.")
+spam2(ipow,__ipow__, "a = ipow(a, b) -- Same as a **= b.")
 spam2(lt,__lt__, "lt(a, b) -- Same as a<b.")
 spam2(le,__le__, "le(a, b) -- Same as a<=b.")
 spam2(eq,__eq__, "eq(a, b) -- Same as a==b.")
diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index a254339..a09e0e2 100644
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -1293,26 +1293,29 @@
 	/* if no docstring given and the getter has one, use that one */
 	if ((doc == NULL || doc == Py_None) && get != NULL) {
 		PyObject *get_doc = PyObject_GetAttrString(get, "__doc__");
-		if (get_doc != NULL) {
-			/* get_doc already INCREF'd by GetAttr */
-			if (Py_TYPE(self)==&PyProperty_Type) {
+		if (get_doc) {
+			if (Py_TYPE(self) == &PyProperty_Type) {
 				Py_XDECREF(prop->prop_doc);
 				prop->prop_doc = get_doc;
-			} else {
-				/* Put __doc__ in dict of the subclass instance instead,
-				otherwise it gets shadowed by class's __doc__. */
-				if (PyObject_SetAttrString(self, "__doc__", get_doc) != 0)
-				{
-					/* DECREF for props handled by _dealloc */
-					Py_DECREF(get_doc);
+			}
+			else {
+				/* If this is a property subclass, put __doc__
+				in dict of the subclass instance instead,
+				otherwise it gets shadowed by __doc__ in the
+				class's dict. */
+				int err = PyObject_SetAttrString(self, "__doc__", get_doc);
+				Py_DECREF(get_doc);
+				if (err < 0)
 					return -1;
-	                        }
-                                Py_DECREF(get_doc);
 			}
 			prop->getter_doc = 1;
-		} else {
+		}
+		else if (PyErr_ExceptionMatches(PyExc_Exception)) {
 			PyErr_Clear();
 		}
+		else {
+			return -1;
+		}
 	}
 
 	return 0;
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 2bab4ef..09fba48 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -183,9 +183,12 @@
 		return NULL;
 	}
 	if (i < 0 || i >= Py_SIZE(op)) {
-		if (indexerr == NULL)
+		if (indexerr == NULL) {
 			indexerr = PyUnicode_FromString(
 				"list index out of range");
+			if (indexerr == NULL)
+				return NULL;
+		}
 		PyErr_SetObject(PyExc_IndexError, indexerr);
 		return NULL;
 	}
@@ -406,9 +409,12 @@
 list_item(PyListObject *a, Py_ssize_t i)
 {
 	if (i < 0 || i >= Py_SIZE(a)) {
-		if (indexerr == NULL)
+		if (indexerr == NULL) {
 			indexerr = PyUnicode_FromString(
 				"list index out of range");
+			if (indexerr == NULL)
+				return NULL;
+		}
 		PyErr_SetObject(PyExc_IndexError, indexerr);
 		return NULL;
 	}
diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index 11dd43d..c1dd228 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -312,7 +312,10 @@
 	if (m->md_def && m->md_def->m_free)
 		m->md_def->m_free(m);
 	if (m->md_dict != NULL) {
-		_PyModule_Clear((PyObject *)m);
+		/* If we are the only ones holding a reference, we can clear
+		   the dictionary. */
+		if (Py_REFCNT(m->md_dict) == 1)
+			_PyModule_Clear((PyObject *)m);
 		Py_DECREF(m->md_dict);
 	}
 	if (m->md_state != NULL)
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index e637cb3..f3ef1cb 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -197,20 +197,26 @@
 	int i;
 	for (i = 0; i < 12; i++) {
 		int c = s[i];
-		if (c == '\0') break;
-		else if (c == '_') buf[i] = '-';
-		else buf[i] = tolower(c);
+		if (c == '\0')
+			break;
+		else if (c == '_')
+			buf[i] = '-';
+		else
+			buf[i] = tolower(c);
 	}
 	buf[i] = '\0';
 	if (strcmp(buf, "utf-8") == 0 ||
-	    strncmp(buf, "utf-8-", 6) == 0) return "utf-8";
+	    strncmp(buf, "utf-8-", 6) == 0)
+		return "utf-8";
 	else if (strcmp(buf, "latin-1") == 0 ||
 		 strcmp(buf, "iso-8859-1") == 0 ||
 		 strcmp(buf, "iso-latin-1") == 0 ||
 		 strncmp(buf, "latin-1-", 8) == 0 ||
 		 strncmp(buf, "iso-8859-1-", 11) == 0 ||
-		 strncmp(buf, "iso-latin-1-", 12) == 0) return "iso-8859-1";
-	else return s;
+		 strncmp(buf, "iso-latin-1-", 12) == 0)
+		return "iso-8859-1";
+	else
+		return s;
 }
 
 /* Return the coding spec in S, or NULL if none is found.  */
@@ -336,12 +342,18 @@
 	/* Disable support for UTF-16 BOMs until a decision
 	   is made whether this needs to be supported.  */
 	} else if (ch == 0xFE) {
-		ch = get_char(tok); if (ch != 0xFF) goto NON_BOM;
-		if (!set_readline(tok, "utf-16-be")) return 0;
+		ch = get_char(tok);
+		if (ch != 0xFF)
+			goto NON_BOM;
+		if (!set_readline(tok, "utf-16-be"))
+			return 0;
 		tok->decoding_state = STATE_NORMAL;
 	} else if (ch == 0xFF) {
-		ch = get_char(tok); if (ch != 0xFE) goto NON_BOM;
-		if (!set_readline(tok, "utf-16-le")) return 0;
+		ch = get_char(tok);
+		if (ch != 0xFE)
+			goto NON_BOM;
+		if (!set_readline(tok, "utf-16-le"))
+			return 0;
 		tok->decoding_state = STATE_NORMAL;
 #endif
 	} else {
@@ -1036,7 +1048,7 @@
 {
 	if (c != EOF) {
 		if (--tok->cur < tok->buf)
-			Py_FatalError("tok_backup: begin of buffer");
+			Py_FatalError("tok_backup: beginning of buffer");
 		if (*tok->cur != c)
 			*tok->cur = c;
 	}