Add new directory "using". This should have been in the merge patch,

but it was probably generated with "svn diff" so that new files that
weren't added first weren't included.

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+.. highlightlang:: none
+
+Command line and environment
+============================
+
+The CPython interpreter scans the command line and the environment for various
+settings.
+
+.. note:: 
+   
+   Other implementation's command line schemes may differ.  See
+   :ref:`implementations` for further resources.
+
+
+Command line
+------------
+
+When invoking Python, you may specify any of these options::
+
+    python [-dEiOQStuUvxX?] [-c command | -m module-name | script | - ] [args]
+
+The most common use case is, of course, a simple invocation of a script::
+
+    python myscript.py
+
+
+Interface options
+~~~~~~~~~~~~~~~~~
+
+The interpreter interface resembles that of the UNIX shell:
+
+* When called with standard input connected to a tty device, it prompts for
+  commands and executes them until an EOF (an end-of-file character, you can
+  produce that with *Ctrl-D* on UNIX or *Ctrl-Z, Enter* on Windows) is read.
+* When called with a file name argument or with a file as standard input, it
+  reads and executes a script from that file.
+* When called with ``-c command``, it executes the Python statement(s) given as
+  *command*.  Here *command* may contain multiple statements separated by
+  newlines. Leading whitespace is significant in Python statements!
+* When called with ``-m module-name``, the given module is searched on the
+  Python module path and executed as a script.
+
+In non-interactive mode, the entire input is parsed before it is executed.
+
+An interface option terminates the list of options consumed by the interpreter,
+all consecutive arguments will end up in :data:`sys.argv` -- note that the first
+element, subscript zero (``sys.argv[0]``), is a string reflecting the program's
+source.
+
+.. cmdoption:: -c <command>
+
+   Execute the Python code in *command*.  *command* can be one ore more
+   statements separated by newlines, with significant leading whitespace as in
+   normal module code.
+   
+   If this option is given, the first element of :data:`sys.argv` will be
+   ``"-c"``.
+
+
+.. cmdoption:: -m <module-name>
+
+   Search :data:`sys.path` for the named module and run the corresponding module
+   file as if it were executed with ``python modulefile.py`` as a script.
+   
+   Since the argument is a *module* name, you must not give a file extension
+   (``.py``).  However, the ``module-name`` does not have to be a valid Python
+   identifer (e.g. you can use a file name including a hyphen).
+
+   .. note::
+
+      This option cannot be used with builtin modules and extension modules
+      written in C, since they do not have Python module files.
+   
+   If this option is given, the first element of :data:`sys.argv` will be the
+   full path to the module file.
+   
+   Many standard library modules contain code that is invoked on their execution
+   as a script.  An example is the :mod:`timeit` module::
+
+       python -mtimeit -s 'setup here' 'benchmarked code here'
+       python -mtimeit -h # for details
+
+   .. seealso:: 
+      :func:`runpy.run_module`
+         The actual implementation of this feature.
+
+      :pep:`338` -- Executing modules as scripts
+
+
+.. describe:: <script>
+
+   Execute the Python code contained in *script*, which must be an (absolute or
+   relative) file name.
+
+   If this option is given, the first element of :data:`sys.argv` will be the
+   script file name as given on the command line.
+
+
+.. describe:: -
+
+   Read commands from standard input (:data:`sys.stdin`).  If standard input is
+   a terminal, :option:`-i` is implied.
+
+   If this option is given, the first element of :data:`sys.argv` will be
+   ``"-"``.
+
+   .. seealso:: 
+      :ref:`tut-invoking`
+
+
+If no script name is given, ``sys.argv[0]`` is an empty string (``""``).
+
+
+Generic options
+~~~~~~~~~~~~~~~
+
+.. cmdoption:: -?
+               -h
+               --help
+
+   Print a short description of all command line options.
+
+
+.. cmdoption:: -V
+               --version
+
+   Print the Python version number and exit.  Example output could be::
+    
+       Python 2.5.1
+
+
+Miscellaneous options
+~~~~~~~~~~~~~~~~~~~~~
+
+.. cmdoption:: -d
+
+   Turn on parser debugging output (for wizards only, depending on compilation
+   options).  See also :envvar:`PYTHONDEBUG`.
+
+
+.. cmdoption:: -E
+
+   Ignore all :envvar:`PYTHON*` environment variables, e.g.
+   :envvar:`PYTHONPATH` and :envvar:`PYTHONHOME`, that might be set.
+
+
+.. cmdoption:: -i
+
+   When a script is passed as first argument or the :option:`-c` option is used,
+   enter interactive mode after executing the script or the command, even when
+   :data:`sys.stdin` does not appear to be a terminal.  The
+   :envvar:`PYTHONSTARTUP` file is not read.
+   
+   This can be useful to inspect global variables or a stack trace when a script
+   raises an exception.  See also :envvar:`PYTHONINSPECT`.
+
+
+.. cmdoption:: -O
+
+   Turn on basic optimizations.  This changes the filename extension for
+   compiled (:term:`bytecode`) files from ``.pyc`` to ``.pyo``.  See also
+   :envvar:`PYTHONOPTIMIZE`.
+
+
+.. cmdoption:: -OO
+
+   Discard docstrings in addition to the :option:`-O` optimizations.
+
+
+.. cmdoption:: -Q <arg>
+
+   Division control. The argument must be one of the following:
+   
+   ``old``
+     division of int/int and long/long return an int or long (*default*)
+   ``new``
+     new division semantics, i.e. division of int/int and long/long returns a
+     float
+   ``warn``
+     old division semantics with a warning for int/int and long/long
+   ``warnall``
+     old division semantics with a warning for all uses of the division operator
+
+   .. seealso::
+      :file:`Tools/scripts/fixdiv.py`
+         for a use of ``warnall``
+
+      :pep:`238` -- Changing the division operator
+
+
+.. cmdoption:: -S
+
+   Disable the import of the module :mod:`site` and the site-dependent
+   manipulations of :data:`sys.path` that it entails.
+
+
+.. cmdoption:: -t
+
+   Issue a warning when a source file mixes tabs and spaces for indentation in a
+   way that makes it depend on the worth of a tab expressed in spaces.  Issue an
+   error when the option is given twice (:option:`-tt`).
+
+
+.. cmdoption:: -u
+   
+   Force stdin, stdout and stderr to be totally unbuffered.  On systems where it
+   matters, also put stdin, stdout and stderr in binary mode.
+   
+   Note that there is internal buffering in :meth:`file.readlines` and
+   :ref:`bltin-file-objects` (``for line in sys.stdin``) which is not influenced
+   by this option.  To work around this, you will want to use
+   :meth:`file.readline` inside a ``while 1:`` loop.
+
+   See also :envvar:`PYTHONUNBUFFERED`.
+
+
+.. XXX should the -U option be documented?
+
+.. cmdoption:: -v
+   
+   Print a message each time a module is initialized, showing the place
+   (filename or built-in module) from which it is loaded.  When given twice
+   (:option:`-vv`), print a message for each file that is checked for when
+   searching for a module.  Also provides information on module cleanup at exit.
+   See also :envvar:`PYTHONVERBOSE`.
+
+
+.. cmdoption:: -W arg
+   
+   Warning control.  Python's warning machinery by default prints warning
+   messages to :data:`sys.stderr`.  A typical warning message has the following
+   form::
+
+       file:line: category: message
+       
+   By default, each warning is printed once for each source line where it
+   occurs.  This option controls how often warnings are printed.
+
+   Multiple :option:`-W` options may be given; when a warning matches more than
+   one option, the action for the last matching option is performed.  Invalid
+   :option:`-W` options are ignored (though, a warning message is printed about
+   invalid options when the first warning is issued).
+   
+   Warnings can also be controlled from within a Python program using the
+   :mod:`warnings` module.
+
+   The simplest form of argument is one of the following action strings (or a
+   unique abbreviation):
+    
+   ``ignore``
+      Ignore all warnings.
+   ``default``
+      Explicitly request the default behavior (printing each warning once per
+      source line).
+   ``all``
+      Print a warning each time it occurs (this may generate many messages if a
+      warning is triggered repeatedly for the same source line, such as inside a
+      loop).
+   ``module``
+      Print each warning only only the first time it occurs in each module.
+   ``once``
+      Print each warning only the first time it occurs in the program.
+   ``error``
+      Raise an exception instead of printing a warning message.
+      
+   The full form of argument is:: 
+   
+       action:message:category:module:line
+
+   Here, *action* is as explained above but only applies to messages that match
+   the remaining fields.  Empty fields match all values; trailing empty fields
+   may be omitted.  The *message* field matches the start of the warning message
+   printed; this match is case-insensitive.  The *category* field matches the
+   warning category.  This must be a class name; the match test whether the
+   actual warning category of the message is a subclass of the specified warning
+   category.  The full class name must be given.  The *module* field matches the
+   (fully-qualified) module name; this match is case-sensitive.  The *line*
+   field matches the line number, where zero matches all line numbers and is
+   thus equivalent to an omitted line number.
+
+   .. seealso::
+
+      :pep:`230` -- Warning framework
+
+
+.. cmdoption:: -x
+   
+   Skip the first line of the source, allowing use of non-Unix forms of
+   ``#!cmd``.  This is intended for a DOS specific hack only.
+   
+   .. warning:: The line numbers in error messages will be off by one!
+
+
+Related files -- UNIX
+---------------------
+
+These are subject to difference depending on local installation conventions;
+:envvar:`prefix` (``${prefix}``) and :envvar:`exec_prefix` (``${exec_prefix}``)
+are installation-dependent and should be interpreted as for GNU software; they
+may be the same.
+
+For example, on most Linux systems, the default for both is :file:`/usr`.
+
++-----------------------------------------------+------------------------------------------+
+| File/directory                                | Meaning                                  |
++===============================================+==========================================+
+| :file:`{exec_prefix}/bin/python`              | Recommended location of the interpreter. |
++-----------------------------------------------+------------------------------------------+
+| :file:`{prefix}/lib/python{version}`,         | Recommended locations of the directories |
+| :file:`{exec_prefix}/lib/python{version}`     | containing the standard modules.         |
++-----------------------------------------------+------------------------------------------+
+| :file:`{prefix}/include/python{version}`,     | Recommended locations of the directories |
+| :file:`{exec_prefix}/include/python{version}` | containing the include files needed for  |
+|                                               | developing Python extensions and         |
+|                                               | embedding the interpreter.               |
++-----------------------------------------------+------------------------------------------+
+| :file:`~/.pythonrc.py`                        | User-specific initialization file loaded |
+|                                               | by the user module; not used by default  |
+|                                               | or by most applications.                 |
++-----------------------------------------------+------------------------------------------+
+
+
+Environment variables
+---------------------
+
+.. envvar:: PYTHONHOME
+   
+   Change the location of the standard Python libraries.  By default, the
+   libraries are searched in :file:`{prefix}/lib/python<version>` and
+   :file:`{exec_prefix}/lib/python<version>`, where :file:`{prefix}` and
+   :file:`{exec_prefix}` are installation-dependent directories, both defaulting
+   to :file:`/usr/local`.
+   
+   When :envvar:`PYTHONHOME` is set to a single directory, its value replaces
+   both :file:`{prefix}` and :file:`{exec_prefix}`.  To specify different values
+   for these, set :envvar:`PYTHONHOME` to :file:`{prefix}:{exec_prefix}``.
+
+
+.. envvar:: PYTHONPATH
+
+   Augments the default search path for module files.  The format is the same as
+   the shell's :envvar:`PATH`: one or more directory pathnames separated by
+   colons.  Non-existent directories are silently ignored.
+   
+   The default search path is installation dependent, but generally begins with
+   :file:`{prefix}/lib/python<version>`` (see :envvar:`PYTHONHOME` above).  It
+   is *always* appended to :envvar:`PYTHONPATH`.
+   
+   If a script argument is given, the directory containing the script is
+   inserted in the path in front of :envvar:`PYTHONPATH`.  The search path can
+   be manipulated from within a Python program as the variable :data:`sys.path`.
+
+
+.. envvar:: PYTHONSTARTUP
+   
+   If this is the name of a readable file, the Python commands in that file are
+   executed before the first prompt is displayed in interactive mode.  The file
+   is executed in the same namespace where interactive commands are executed so
+   that objects defined or imported in it can be used without qualification in
+   the interactive session.  You can also change the prompts :data:`sys.ps1` and
+   :data:`sys.ps2` in this file.
+
+
+.. envvar:: PYTHONY2K
+   
+   Set this to a non-empty string to cause the :mod:`time` module to require
+   dates specified as strings to include 4-digit years, otherwise 2-digit years
+   are converted based on rules described in the :mod:`time` module
+   documentation.
+
+
+.. envvar:: PYTHONOPTIMIZE
+   
+   If this is set to a non-empty string it is equivalent to specifying the
+   :option:`-O` option.  If set to an integer, it is equivalent to specifying
+   :option:`-O` multiple times.
+
+
+.. envvar:: PYTHONDEBUG
+   
+   If this is set to a non-empty string it is equivalent to specifying the
+   :option:`-d` option.  If set to an integer, it is equivalent to specifying
+   :option:`-d` multiple times.
+
+
+.. envvar:: PYTHONINSPECT
+   
+   If this is set to a non-empty string it is equivalent to specifying the
+   :option:`-i` option.
+
+
+.. envvar:: PYTHONUNBUFFERED
+   
+   If this is set to a non-empty string it is equivalent to specifying the
+   :option:`-u` option.
+
+
+.. envvar:: PYTHONVERBOSE
+   
+   If this is set to a non-empty string it is equivalent to specifying the
+   :option:`-v` option.  If set to an integer, it is equivalent to specifying
+   :option:`-v` multiple times.
+
+
+.. envvar:: PYTHONCASEOK
+   
+   If this is set, Python ignores case in :keyword:`import` statements.  This
+   only works on Windows.
+