Merge doc fixes from 3.6

17 files changed, 76 insertions, 76 deletions

diff --git a/Doc/howto/logging-cookbook.rst b/Doc/howto/logging-cookbook.rst
index f962cd8..bb79bb1 100644
--- a/Doc/howto/logging-cookbook.rst
+++ b/Doc/howto/logging-cookbook.rst
@@ -2165,8 +2165,8 @@ Speaking logging messages
 -------------------------
 
 There might be situations when it is desirable to have logging messages rendered
-in an audible rather than a visible format. This is easy to do if you have text-
-to-speech (TTS) functionality available in your system, even if it doesn't have
+in an audible rather than a visible format. This is easy to do if you have
+text-to-speech (TTS) functionality available in your system, even if it doesn't have
 a Python binding. Most TTS systems have a command line program you can run, and
 this can be invoked from a handler using :mod:`subprocess`. It's assumed here
 that TTS command line programs won't expect to interact with users or take a
diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index c6b2bf6..4530304 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -174,7 +174,7 @@ ArgumentParser objects
    * conflict_handler_ - The strategy for resolving conflicting optionals
      (usually unnecessary)
 
-   * add_help_ - Add a -h/--help option to the parser (default: ``True``)
+   * add_help_ - Add a ``-h/--help`` option to the parser (default: ``True``)
 
    * allow_abbrev_ - Allows long options to be abbreviated if the
      abbreviation is unambiguous. (default: ``True``)
@@ -211,7 +211,7 @@ The help for this program will display ``myprogram.py`` as the program name
     -h, --help  show this help message and exit
     --foo FOO   foo help
    $ cd ..
-   $ python subdir\myprogram.py --help
+   $ python subdir/myprogram.py --help
    usage: myprogram.py [-h] [--foo FOO]
 
    optional arguments:
diff --git a/Doc/library/logging.config.rst b/Doc/library/logging.config.rst
index a68a890..a7928a0 100644
--- a/Doc/library/logging.config.rst
+++ b/Doc/library/logging.config.rst
@@ -105,8 +105,8 @@ in :mod:`logging` itself) and defining handlers which are declared either in
    :param disable_existing_loggers: If specified as ``False``, loggers which
                                     exist when this call is made are left
                                     enabled. The default is ``True`` because this
-                                    enables old behaviour in a backward-
-                                    compatible way. This behaviour is to
+                                    enables old behaviour in a
+                                    backward-compatible way. This behaviour is to
                                     disable any existing loggers unless they or
                                     their ancestors are explicitly named in the
                                     logging configuration.
diff --git a/Doc/library/logging.handlers.rst b/Doc/library/logging.handlers.rst
index 5fc32d1..f13f765 100644
--- a/Doc/library/logging.handlers.rst
+++ b/Doc/library/logging.handlers.rst
@@ -946,8 +946,8 @@ possible, while any potentially slow operations (such as sending an email via
 .. class:: QueueHandler(queue)
 
    Returns a new instance of the :class:`QueueHandler` class. The instance is
-   initialized with the queue to send messages to. The queue can be any queue-
-   like object; it's used as-is by the :meth:`enqueue` method, which needs
+   initialized with the queue to send messages to. The queue can be any
+   queue-like object; it's used as-is by the :meth:`enqueue` method, which needs
    to know how to send messages to it.
 
 
@@ -1002,8 +1002,8 @@ possible, while any potentially slow operations (such as sending an email via
 
    Returns a new instance of the :class:`QueueListener` class. The instance is
    initialized with the queue to send messages to and a list of handlers which
-   will handle entries placed on the queue. The queue can be any queue-
-   like object; it's passed as-is to the :meth:`dequeue` method, which needs
+   will handle entries placed on the queue. The queue can be any queue-like
+   object; it's passed as-is to the :meth:`dequeue` method, which needs
    to know how to get messages from it. If ``respect_handler_level`` is ``True``,
    a handler's level is respected (compared with the level for the message) when
    deciding whether to pass messages to that handler; otherwise, the behaviour
diff --git a/Doc/library/quopri.rst b/Doc/library/quopri.rst
index ef2b5f2..a3f94a0 100644
--- a/Doc/library/quopri.rst
+++ b/Doc/library/quopri.rst
@@ -32,8 +32,8 @@ sending a graphics file.
 
 .. function:: encode(input, output, quotetabs, header=False)
 
-   Encode the contents of the *input* file and write the resulting quoted-
-   printable data to the *output* file. *input* and *output* must be
+   Encode the contents of the *input* file and write the resulting quoted-printable
+   data to the *output* file. *input* and *output* must be
    :term:`binary file objects <file object>`. *quotetabs*, a flag which controls
    whether to encode embedded spaces and tabs must be provideda and when true it
    encodes such embedded whitespace, and when false it leaves them unencoded.
diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index 252b6db..ef5eec3 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -1354,8 +1354,8 @@ to sockets.
    to transmit as opposed to sending the file until EOF is reached. File
    position is updated on return or also in case of error in which case
    :meth:`file.tell() <io.IOBase.tell>` can be used to figure out the number of
-   bytes which were sent. The socket must be of :const:`SOCK_STREAM` type. Non-
-   blocking sockets are not supported.
+   bytes which were sent. The socket must be of :const:`SOCK_STREAM` type.
+   Non-blocking sockets are not supported.
 
    .. versionadded:: 3.5
 
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index c13a731..258d3c2 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -1637,11 +1637,11 @@ Loading and running tests
 
       The method optionally resolves *name* relative to the given *module*.
 
-   .. versionchanged:: 3.5
-      If an :exc:`ImportError` or :exc:`AttributeError` occurs while traversing
-      *name* then a synthetic test that raises that error when run will be
-      returned. These errors are included in the errors accumulated by
-      self.errors.
+      .. versionchanged:: 3.5
+         If an :exc:`ImportError` or :exc:`AttributeError` occurs while traversing
+         *name* then a synthetic test that raises that error when run will be
+         returned. These errors are included in the errors accumulated by
+         self.errors.
 
 
    .. method:: loadTestsFromNames(names, module=None)
diff --git a/Doc/whatsnew/2.0.rst b/Doc/whatsnew/2.0.rst
index 010a007..5cbf501 100644
--- a/Doc/whatsnew/2.0.rst
+++ b/Doc/whatsnew/2.0.rst
@@ -145,8 +145,8 @@ strings.  Unicode uses 16-bit numbers to represent characters instead of the
 8-bit number used by ASCII, meaning that 65,536 distinct characters can be
 supported.
 
-The final interface for Unicode support was arrived at through countless often-
-stormy discussions on the python-dev mailing list, and mostly implemented by
+The final interface for Unicode support was arrived at through countless
+often-stormy discussions on the python-dev mailing list, and mostly implemented by
 Marc-André Lemburg, based on a Unicode string type implementation by Fredrik
 Lundh.  A detailed explanation of the interface was written up as :pep:`100`,
 "Python Unicode Integration". This article will simply cover the most
@@ -885,8 +885,8 @@ interfaces for processing XML have become common: SAX2 (version 2 of the Simple
 API for XML) provides an event-driven interface with some similarities to
 :mod:`xmllib`, and the DOM (Document Object Model) provides a tree-based
 interface, transforming an XML document into a tree of nodes that can be
-traversed and modified.  Python 2.0 includes a SAX2 interface and a stripped-
-down DOM interface as part of the :mod:`xml` package. Here we will give a brief
+traversed and modified.  Python 2.0 includes a SAX2 interface and a stripped-down
+DOM interface as part of the :mod:`xml` package. Here we will give a brief
 overview of these new interfaces; consult the Python documentation or the source
 code for complete details. The Python XML SIG is also working on improved
 documentation.
diff --git a/Doc/whatsnew/2.1.rst b/Doc/whatsnew/2.1.rst
index 380edec..3486cdd 100644
--- a/Doc/whatsnew/2.1.rst
+++ b/Doc/whatsnew/2.1.rst
@@ -159,8 +159,8 @@ precede any statement that will result in bytecodes being produced.
 PEP 207: Rich Comparisons
 =========================
 
-In earlier versions, Python's support for implementing comparisons on user-
-defined classes and extension types was quite simple. Classes could implement a
+In earlier versions, Python's support for implementing comparisons on user-defined
+classes and extension types was quite simple. Classes could implement a
 :meth:`__cmp__` method that was given two instances of a class, and could only
 return 0 if they were equal or +1 or -1 if they weren't; the method couldn't
 raise an exception or return anything other than a Boolean value.  Users of
@@ -465,11 +465,11 @@ Windows being the primary examples; on these systems, it's impossible to
 distinguish the filenames ``FILE.PY`` and ``file.py``, even though they do store
 the file's name  in its original case (they're case-preserving, too).
 
-In Python 2.1, the :keyword:`import` statement will work to simulate case-
-sensitivity on case-insensitive platforms.  Python will now search for the first
+In Python 2.1, the :keyword:`import` statement will work to simulate case-sensitivity
+on case-insensitive platforms.  Python will now search for the first
 case-sensitive match by default, raising an :exc:`ImportError` if no such file
-is found, so ``import file`` will not import a module named ``FILE.PY``.  Case-
-insensitive matching can be requested by setting the :envvar:`PYTHONCASEOK`
+is found, so ``import file`` will not import a module named ``FILE.PY``.
+Case-insensitive matching can be requested by setting the :envvar:`PYTHONCASEOK`
 environment variable before starting the Python interpreter.
 
 .. ======================================================================
@@ -481,8 +481,8 @@ PEP 217: Interactive Display Hook
 When using the Python interpreter interactively, the output of commands is
 displayed using the built-in :func:`repr` function. In Python 2.1, the variable
 :func:`sys.displayhook` can be set to a callable object which will be called
-instead of :func:`repr`. For example, you can set it to a special pretty-
-printing function::
+instead of :func:`repr`. For example, you can set it to a special
+pretty-printing function::
 
    >>> # Create a recursive data structure
    ... L = [1,2,3]
diff --git a/Doc/whatsnew/2.2.rst b/Doc/whatsnew/2.2.rst
index 5f28c29..a0bb81a 100644
--- a/Doc/whatsnew/2.2.rst
+++ b/Doc/whatsnew/2.2.rst
@@ -962,8 +962,8 @@ New and Improved Modules
 * The new :mod:`hmac` module implements the HMAC algorithm described by
   :rfc:`2104`. (Contributed by Gerhard Häring.)
 
-* Several functions that originally returned lengthy tuples now return pseudo-
-  sequences that still behave like tuples but also have mnemonic attributes such
+* Several functions that originally returned lengthy tuples now return
+  pseudo-sequences that still behave like tuples but also have mnemonic attributes such
   as memberst_mtime or :attr:`tm_year`. The enhanced functions include
   :func:`stat`, :func:`fstat`, :func:`statvfs`, and :func:`fstatvfs` in the
   :mod:`os` module, and :func:`localtime`, :func:`gmtime`, and :func:`strptime` in
@@ -1141,8 +1141,8 @@ Some of the more notable changes are:
 
   The most significant change is the ability to build Python as a framework,
   enabled by supplying the :option:`!--enable-framework` option to the configure
-  script when compiling Python.  According to Jack Jansen, "This installs a self-
-  contained Python installation plus the OS X framework "glue" into
+  script when compiling Python.  According to Jack Jansen, "This installs a
+  self-contained Python installation plus the OS X framework "glue" into
   :file:`/Library/Frameworks/Python.framework` (or another location of choice).
   For now there is little immediate added benefit to this (actually, there is the
   disadvantage that you have to change your PATH to be able to find Python), but
diff --git a/Doc/whatsnew/2.3.rst b/Doc/whatsnew/2.3.rst
index 93930b8..cebfb21 100644
--- a/Doc/whatsnew/2.3.rst
+++ b/Doc/whatsnew/2.3.rst
@@ -86,8 +86,8 @@ The union and intersection of sets can be computed with the :meth:`union` and
 It's also possible to take the symmetric difference of two sets.  This is the
 set of all elements in the union that aren't in the intersection.  Another way
 of putting it is that the symmetric difference contains all elements that are in
-exactly one set.  Again, there's an alternative notation (``^``), and an in-
-place version with the ungainly name :meth:`symmetric_difference_update`. ::
+exactly one set.  Again, there's an alternative notation (``^``), and an
+in-place version with the ungainly name :meth:`symmetric_difference_update`. ::
 
    >>> S1 = sets.Set([1,2,3,4])
    >>> S2 = sets.Set([3,4,5,6])
@@ -288,8 +288,8 @@ use characters outside of the usual alphanumerics.
 PEP 273: Importing Modules from ZIP Archives
 ============================================
 
-The new :mod:`zipimport` module adds support for importing modules from a ZIP-
-format archive.  You don't need to import the module explicitly; it will be
+The new :mod:`zipimport` module adds support for importing modules from a
+ZIP-format archive.  You don't need to import the module explicitly; it will be
 automatically imported if a ZIP archive's filename is added to ``sys.path``.
 For example:
 
@@ -375,8 +375,8 @@ PEP 278: Universal Newline Support
 ==================================
 
 The three major operating systems used today are Microsoft Windows, Apple's
-Macintosh OS, and the various Unix derivatives.  A minor irritation of cross-
-platform work  is that these three platforms all use different characters to
+Macintosh OS, and the various Unix derivatives.  A minor irritation of
+cross-platform work  is that these three platforms all use different characters to
 mark the ends of lines in text files.  Unix uses the linefeed (ASCII character
 10), MacOS uses the carriage return (ASCII character 13), and Windows uses a
 two-character sequence of a carriage return plus a newline.
diff --git a/Doc/whatsnew/2.4.rst b/Doc/whatsnew/2.4.rst
index 8db90cc..7c125ff 100644
--- a/Doc/whatsnew/2.4.rst
+++ b/Doc/whatsnew/2.4.rst
@@ -517,8 +517,8 @@ Sometimes you can see this inaccuracy when the number is printed::
    >>> 1.1
    1.1000000000000001
 
-The inaccuracy isn't always visible when you print the number because the FP-to-
-decimal-string conversion is provided by the C library, and most C libraries try
+The inaccuracy isn't always visible when you print the number because the
+FP-to-decimal-string conversion is provided by the C library, and most C libraries try
 to produce sensible output.  Even if it's not displayed, however, the inaccuracy
 is still there and subsequent operations can magnify the error.
 
@@ -595,8 +595,8 @@ exponent::
      ...
    decimal.InvalidOperation: x ** (non-integer)
 
-You can combine :class:`Decimal` instances with integers, but not with floating-
-point numbers::
+You can combine :class:`Decimal` instances with integers, but not with
+floating-point numbers::
 
    >>> a + 4
    Decimal("39.72")
@@ -684,8 +684,8 @@ includes a quick-start tutorial and a reference.
       Raymond Hettinger, Aahz, and Tim Peters.
 
    http://www.lahey.com/float.htm
-      The article uses Fortran code to illustrate many of the problems that floating-
-      point inaccuracy can cause.
+      The article uses Fortran code to illustrate many of the problems that
+      floating-point inaccuracy can cause.
 
    http://speleotrove.com/decimal/
       A description of a decimal-based representation.  This representation is being
@@ -741,8 +741,8 @@ functions in Python's implementation required that the numeric locale remain set
 to the ``'C'`` locale.  Often this was because the code was using the C
 library's :c:func:`atof` function.
 
-Not setting the numeric locale caused trouble for extensions that used third-
-party C libraries, however, because they wouldn't have the correct locale set.
+Not setting the numeric locale caused trouble for extensions that used third-party
+C libraries, however, because they wouldn't have the correct locale set.
 The motivating example was GTK+, whose user interface widgets weren't displaying
 numbers in the current locale.
 
@@ -918,8 +918,8 @@ Here are all of the changes that Python 2.4 makes to the core Python language.
 
   (Contributed by Raymond Hettinger.)
 
-* Encountering a failure while importing a module no longer leaves a partially-
-  initialized module object in ``sys.modules``.  The incomplete module object left
+* Encountering a failure while importing a module no longer leaves a partially-initialized
+  module object in ``sys.modules``.  The incomplete module object left
   behind would fool further imports of the same module into succeeding, leading to
   confusing errors.   (Fixed by Tim Peters.)
 
@@ -1028,8 +1028,8 @@ complete list of changes, or look through the CVS logs for all the details.
   previous ones left off.  (Implemented by Walter Dörwald.)
 
 * There is a new :mod:`collections` module for  various specialized collection
-  datatypes.   Currently it contains just one type, :class:`deque`,  a double-
-  ended queue that supports efficiently adding and removing elements from either
+  datatypes.  Currently it contains just one type, :class:`deque`, a double-ended
+  queue that supports efficiently adding and removing elements from either
   end::
 
      >>> from collections import deque
@@ -1485,8 +1485,8 @@ Some of the changes to Python's build process and to the C API are:
   intended as an aid to people developing the Python core.  Providing
   :option:`!--enable-profiling` to the :program:`configure` script will let you
   profile the interpreter with :program:`gprof`, and providing the
-  :option:`!--with-tsc` switch enables profiling using the Pentium's Time-Stamp-
-  Counter register.  Note that the :option:`!--with-tsc` switch is slightly
+  :option:`!--with-tsc` switch enables profiling using the Pentium's
+  Time-Stamp-Counter register.  Note that the :option:`!--with-tsc` switch is slightly
   misnamed, because the profiling feature also works on the PowerPC platform,
   though that processor architecture doesn't call that register "the TSC
   register".  (Contributed by Jeremy Hylton.)
@@ -1540,8 +1540,8 @@ code:
 
 * The :mod:`tarfile` module now generates GNU-format tar files by default.
 
-* Encountering a failure while importing a module no longer leaves a partially-
-  initialized module object in ``sys.modules``.
+* Encountering a failure while importing a module no longer leaves a
+  partially-initialized module object in ``sys.modules``.
 
 * :const:`None` is now a constant; code that binds a new value to  the name
   ``None`` is now a syntax error.
diff --git a/Doc/whatsnew/2.5.rst b/Doc/whatsnew/2.5.rst
index db8f9df..4d48291 100644
--- a/Doc/whatsnew/2.5.rst
+++ b/Doc/whatsnew/2.5.rst
@@ -157,8 +157,8 @@ Here's a small but realistic example::
    server_log = functools.partial(log, subsystem='server')
    server_log('Unable to open socket')
 
-Here's another example, from a program that uses PyGTK.  Here a context-
-sensitive pop-up menu is being constructed dynamically.  The callback provided
+Here's another example, from a program that uses PyGTK.  Here a context-sensitive
+pop-up menu is being constructed dynamically.  The callback provided
 for the menu option is a partially applied version of the :meth:`open_item`
 method, where the first argument has been provided. ::
 
@@ -171,8 +171,8 @@ method, where the first argument has been provided. ::
            popup_menu.append( ("Open", open_func, 1) )
 
 Another function in the :mod:`functools` module is the
-``update_wrapper(wrapper, wrapped)`` function that helps you write well-
-behaved decorators.  :func:`update_wrapper` copies the name, module, and
+``update_wrapper(wrapper, wrapped)`` function that helps you write
+well-behaved decorators.  :func:`update_wrapper` copies the name, module, and
 docstring attribute to a wrapper function so that tracebacks inside the wrapped
 function are easier to understand.  For example, you might write::
 
@@ -297,8 +297,8 @@ can't protect against having your submodule's name being used for a new module
 added in a future version of Python.
 
 In Python 2.5, you can switch :keyword:`import`'s behaviour to  absolute imports
-using a ``from __future__ import absolute_import`` directive.  This absolute-
-import behaviour will become the default in a future version (probably Python
+using a ``from __future__ import absolute_import`` directive.  This absolute-import
+behaviour will become the default in a future version (probably Python
 2.7).  Once absolute imports  are the default, ``import string`` will always
 find the standard library's version. It's suggested that users should begin
 using absolute imports as much as possible, so it's preferable to begin writing
@@ -602,8 +602,8 @@ be used with the ':keyword:`with`' statement. File objects are one example::
            ... more processing code ...
 
 After this statement has executed, the file object in *f* will have been
-automatically closed, even if the :keyword:`for` loop raised an exception part-
-way through the block.
+automatically closed, even if the :keyword:`for` loop raised an exception
+part-way through the block.
 
 .. note::
 
@@ -1558,8 +1558,8 @@ complete list of changes, or look through the SVN logs for all the details.
 
   You can also pack and unpack data to and from buffer objects directly using the
   ``pack_into(buffer, offset, v1, v2, ...)`` and ``unpack_from(buffer,
-  offset)`` methods.  This lets you store data directly into an array or a memory-
-  mapped file.
+  offset)`` methods.  This lets you store data directly into an array or a
+  memory-mapped file.
 
   (:class:`Struct` objects were implemented by Bob Ippolito at the NeedForSpeed
   sprint.  Support for buffer objects was added by Martin Blais, also at the
@@ -2281,8 +2281,8 @@ Acknowledgements
 
 The author would like to thank the following people for offering suggestions,
 corrections and assistance with various drafts of this article: Georg Brandl,
-Nick Coghlan, Phillip J. Eby, Lars Gustäbel, Raymond Hettinger, Ralf W. Grosse-
-Kunstleve, Kent Johnson, Iain Lowe, Martin von Löwis, Fredrik Lundh, Andrew
+Nick Coghlan, Phillip J. Eby, Lars Gustäbel, Raymond Hettinger, Ralf W.
+Grosse-Kunstleve, Kent Johnson, Iain Lowe, Martin von Löwis, Fredrik Lundh, Andrew
 McNamara, Skip Montanaro, Gustavo Niemeyer, Paul Prescod, James Pryor, Mike
 Rovner, Scott Weikart, Barry Warsaw, Thomas Wouters.
 
diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst
index 4fc0c36..cc2fa3d 100644
--- a/Doc/whatsnew/2.6.rst
+++ b/Doc/whatsnew/2.6.rst
@@ -290,8 +290,8 @@ be used with the ':keyword:`with`' statement. File objects are one example::
            ... more processing code ...
 
 After this statement has executed, the file object in *f* will have been
-automatically closed, even if the :keyword:`for` loop raised an exception part-
-way through the block.
+automatically closed, even if the :keyword:`for` loop raised an exception
+part-way through the block.
 
 .. note::
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 10f93ba..5aaec70 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -795,7 +795,7 @@ Library
   WeakValueDictionary.pop() when a GC collection happens in another
   thread.
 
-- Issue #20191: Fixed a crash in resource.prlimit() when pass a sequence that
+- Issue #20191: Fixed a crash in resource.prlimit() when passing a sequence that
   doesn't own its elements as limits.
 
 - Issue #28779: multiprocessing.set_forkserver_preload() would crash the
@@ -1289,9 +1289,9 @@ Library
 - Issue #28227: gzip now supports pathlib.  Patch by Ethan Furman.
 
 - Issue #27358: Optimized merging var-keyword arguments and improved error
-  message when pass a non-mapping as a var-keyword argument.
+  message when passing a non-mapping as a var-keyword argument.
 
-- Issue #28257: Improved error message when pass a non-iterable as
+- Issue #28257: Improved error message when passing a non-iterable as
   a var-positional argument.  Added opcode BUILD_TUPLE_UNPACK_WITH_CALL.
 
 - Issue #28322: Fixed possible crashes when unpickle itertools objects from
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 0a6dfe1..1d32d53 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -1012,7 +1012,7 @@ _io_TextIOWrapper___init___impl(textio *self, PyObject *buffer,
                                                            errors);
         if (self->encoder == NULL)
             goto error;
-        /* Get the normalized named of the codec */
+        /* Get the normalized name of the codec */
         res = _PyObject_GetAttrId(codec_info, &PyId_name);
         if (res == NULL) {
             if (PyErr_ExceptionMatches(PyExc_AttributeError))
diff --git a/Objects/odictobject.c b/Objects/odictobject.c
index 8e6d643..5833df5 100644
--- a/Objects/odictobject.c
+++ b/Objects/odictobject.c
@@ -2231,7 +2231,7 @@ odictvalues_new(PyObject *od)
 
 
 /* ----------------------------------------------
-   MutableMappping implementations
+   MutableMapping implementations
 
 Mapping: