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.. highlightlang:: rest
Differences to the LaTeX markup
===============================
Though the markup language is different, most of the concepts and markup types
of the old LaTeX docs have been kept -- environments as reST directives, inline
commands as reST roles and so forth.
However, there are some differences in the way these work, partly due to the
differences in the markup languages, partly due to improvements in Sphinx. This
section lists these differences, in order to give those familiar with the old
format a quick overview of what they might run into.
Inline markup
-------------
These changes have been made to inline markup:
* **Cross-reference roles**
Most of the following semantic roles existed previously as inline commands,
but didn't do anything except formatting the content as code. Now, they
cross-reference to known targets (some names have also been shortened):
| *mod* (previously *refmodule* or *module*)
| *func* (previously *function*)
| *data* (new)
| *const*
| *class*
| *meth* (previously *method*)
| *attr* (previously *member*)
| *exc* (previously *exception*)
| *cdata*
| *cfunc* (previously *cfunction*)
| *cmacro* (previously *csimplemacro*)
| *ctype*
Also different is the handling of *func* and *meth*: while previously
parentheses were added to the callable name (like ``\func{str()}``), they are
now appended by the build system -- appending them in the source will result
in double parentheses. This also means that ``:func:`str(object)``` will not
work as expected -- use ````str(object)```` instead!
* **Inline commands implemented as directives**
These were inline commands in LaTeX, but are now directives in reST:
| *deprecated*
| *versionadded*
| *versionchanged*
These are used like so::
.. deprecated:: 2.5
Reason of deprecation.
Also, no period is appended to the text for *versionadded* and
*versionchanged*.
| *note*
| *warning*
These are used like so::
.. note::
Content of note.
* **Otherwise changed commands**
The *samp* command previously formatted code and added quotation marks around
it. The *samp* role, however, features a new highlighting system just like
*file* does:
``:samp:`open({filename}, {mode})``` results in :samp:`open({filename}, {mode})`
* **Dropped commands**
These were commands in LaTeX, but are not available as roles:
| *bfcode*
| *character* (use :samp:`\`\`'c'\`\``)
| *citetitle* (use ```Title <URL>`_``)
| *code* (use ````code````)
| *email* (just write the address in body text)
| *filenq*
| *filevar* (use the ``{...}`` highlighting feature of *file*)
| *programopt*, *longprogramopt* (use *option*)
| *ulink* (use ```Title <URL>`_``)
| *url* (just write the URL in body text)
| *var* (use ``*var*``)
| *infinity*, *plusminus* (use the Unicode character)
| *shortversion*, *version* (use the ``|version|`` and ``|release|`` substitutions)
| *emph*, *strong* (use the reST markup)
* **Backslash escaping**
In reST, a backslash must be escaped in normal text, and in the content of
roles. However, in code literals and literal blocks, it must not be escaped.
Example: ``:file:`C:\\Temp\\my.tmp``` vs. ````open("C:\Temp\my.tmp")````.
Information units
-----------------
Information units (*...desc* environments) have been made reST directives.
These changes to information units should be noted:
* **New names**
"desc" has been removed from every name. Additionally, these directives have
new names:
| *cfunction* (previously *cfuncdesc*)
| *cmacro* (previously *csimplemacrodesc*)
| *exception* (previously *excdesc*)
| *function* (previously *funcdesc*)
| *attribute* (previously *memberdesc*)
The *classdesc\** and *excclassdesc* environments have been dropped, the
*class* and *exception* directives support classes documented with and without
constructor arguments.
* **Multiple objects**
The equivalent of the *...line* commands is::
.. function:: do_foo(bar)
do_bar(baz)
Description of the functions.
IOW, just give one signatures per line, at the same indentation level.
* **Arguments**
There is no *optional* command. Just give function signatures like they
should appear in the output::
.. function:: open(filename[, mode[, buffering]])
Description.
Note: markup in the signature is not supported.
* **Indexing**
The *...descni* environments have been dropped. To mark an information unit
as unsuitable for index entry generation, use the *noindex* option like so::
.. function:: foo_*
:noindex:
Description.
* **New information unit**
There is a new generic information unit called "describe" which can be used
to document things that are not covered by the other units::
.. describe:: a == b
The equals operator.
Structure
---------
The LaTeX docs were split in several toplevel manuals. Now, all files
are part of the same documentation tree, as indicated by the *toctree*
directives in the sources. Every *toctree* directive embeds other files
as subdocuments of the current file (this structure is not necessarily
mirrored in the filesystem layout). The toplevel file is
:file:`contents.rst`.
However, most of the old directory structure has been kept, with the
directories renamed as follows:
* :file:`api` -> :file:`c-api`
* :file:`dist` -> :file:`distutils`, with the single TeX file split up
* :file:`doc` -> :file:`documenting`
* :file:`ext` -> :file:`extending`
* :file:`inst` -> :file:`installing`
* :file:`lib` -> :file:`library`
* :file:`mac` -> merged into :file:`library`, with `mac/using.tex`
moved to `howto/pythonmac.rst`
* :file:`ref` -> :file:`reference`
* :file:`tut` -> :file:`tutorial`, with the single TeX file split up
.. XXX more (index-generating, production lists, ...)

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.. _documenting-index:
######################
Documenting Python
######################
The Python language has a substantial body of documentation, much of it
contributed by various authors. The markup used for the Python documentation is
`reStructuredText`_, developed by the `docutils`_ project, amended by custom
directives and using a toolset named *Sphinx* to postprocess the HTML output.
This document describes the style guide for our documentation, the custom
reStructuredText markup introduced to support Python documentation and how it
should be used, as well as the Sphinx build system.
.. _reStructuredText: http://docutils.sf.net/rst.html
.. _docutils: http://docutils.sf.net/
If you're interested in contributing to Python's documentation, there's no need
to write reStructuredText if you're not so inclined; plain text contributions
are more than welcome as well.
.. toctree::
intro.rst
style.rst
rest.rst
markup.rst
sphinx.rst
.. XXX add credits, thanks etc.

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Introduction
============
Python's documentation has long been considered to be good for a free
programming language. There are a number of reasons for this, the most
important being the early commitment of Python's creator, Guido van Rossum, to
providing documentation on the language and its libraries, and the continuing
involvement of the user community in providing assistance for creating and
maintaining documentation.
The involvement of the community takes many forms, from authoring to bug reports
to just plain complaining when the documentation could be more complete or
easier to use.
This document is aimed at authors and potential authors of documentation for
Python. More specifically, it is for people contributing to the standard
documentation and developing additional documents using the same tools as the
standard documents. This guide will be less useful for authors using the Python
documentation tools for topics other than Python, and less useful still for
authors not using the tools at all.
If your interest is in contributing to the Python documentation, but you don't
have the time or inclination to learn reStructuredText and the markup structures
documented here, there's a welcoming place for you among the Python contributors
as well. Any time you feel that you can clarify existing documentation or
provide documentation that's missing, the existing documentation team will
gladly work with you to integrate your text, dealing with the markup for you.
Please don't let the material in this document stand between the documentation
and your desire to help out!

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.. highlightlang:: rest
Additional Markup Constructs
============================
Sphinx adds a lot of new directives and interpreted text roles to standard reST
markup. This section contains the reference material for these facilities.
Documentation for "standard" reST constructs is not included here, though
they are used in the Python documentation.
File-wide metadata
------------------
reST has the concept of "field lists"; these are a sequence of fields marked up
like this::
:Field name: Field content
A field list at the very top of a file is parsed as the "docinfo", which in
normal documents can be used to record the author, date of publication and
other metadata. In Sphinx, the docinfo is used as metadata, too, but not
displayed in the output.
At the moment, only one metadata field is recognized:
``nocomments``
If set, the web application won't display a comment form for a page generated
from this source file.
Meta-information markup
-----------------------
.. describe:: sectionauthor
Identifies the author of the current section. The argument should include
the author's name such that it can be used for presentation (though it isn't)
and email address. The domain name portion of the address should be lower
case. Example::
.. sectionauthor:: Guido van Rossum <guido@python.org>
Currently, this markup isn't reflected in the output in any way, but it helps
keep track of contributions.
Module-specific markup
----------------------
The markup described in this section is used to provide information about a
module being documented. Each module should be documented in its own file.
Normally this markup appears after the title heading of that file; a typical
file might start like this::
:mod:`parrot` -- Dead parrot access
===================================
.. module:: parrot
:platform: Unix, Windows
:synopsis: Analyze and reanimate dead parrots.
.. moduleauthor:: Eric Cleese <eric@python.invalid>
.. moduleauthor:: John Idle <john@python.invalid>
As you can see, the module-specific markup consists of two directives, the
``module`` directive and the ``moduleauthor`` directive.
.. describe:: module
This directive marks the beginning of the description of a module (or package
submodule, in which case the name should be fully qualified, including the
package name).
The ``platform`` option, if present, is a comma-separated list of the
platforms on which the module is available (if it is available on all
platforms, the option should be omitted). The keys are short identifiers;
examples that are in use include "IRIX", "Mac", "Windows", and "Unix". It is
important to use a key which has already been used when applicable.
The ``synopsis`` option should consist of one sentence describing the
module's purpose -- it is currently only used in the Global Module Index.
.. describe:: moduleauthor
The ``moduleauthor`` directive, which can appear multiple times, names the
authors of the module code, just like ``sectionauthor`` names the author(s)
of a piece of documentation. It too does not result in any output currently.
.. note::
It is important to make the section title of a module-describing file
meaningful since that value will be inserted in the table-of-contents trees
in overview files.
Information units
-----------------
There are a number of directives used to describe specific features provided by
modules. Each directive requires one or more signatures to provide basic
information about what is being described, and the content should be the
description. The basic version makes entries in the general index; if no index
entry is desired, you can give the directive option flag ``:noindex:``. The
following example shows all of the features of this directive type::
.. function:: spam(eggs)
ham(eggs)
:noindex:
Spam or ham the foo.
The signatures of object methods or data attributes should always include the
type name (``.. method:: FileInput.input(...)``), even if it is obvious from the
context which type they belong to; this is to enable consistent
cross-references. If you describe methods belonging to an abstract protocol,
such as "context managers", include a (pseudo-)type name too to make the
index entries more informative.
The directives are:
.. describe:: cfunction
Describes a C function. The signature should be given as in C, e.g.::
.. cfunction:: PyObject* PyType_GenericAlloc(PyTypeObject *type, Py_ssize_t nitems)
This is also used to describe function-like preprocessor macros. The names
of the arguments should be given so they may be used in the description.
Note that you don't have to backslash-escape asterisks in the signature,
as it is not parsed by the reST inliner.
.. describe:: cmember
Describes a C struct member. Example signature::
.. cmember:: PyObject* PyTypeObject.tp_bases
The text of the description should include the range of values allowed, how
the value should be interpreted, and whether the value can be changed.
References to structure members in text should use the ``member`` role.
.. describe:: cmacro
Describes a "simple" C macro. Simple macros are macros which are used
for code expansion, but which do not take arguments so cannot be described as
functions. This is not to be used for simple constant definitions. Examples
of its use in the Python documentation include :cmacro:`PyObject_HEAD` and
:cmacro:`Py_BEGIN_ALLOW_THREADS`.
.. describe:: ctype
Describes a C type. The signature should just be the type name.
.. describe:: cvar
Describes a global C variable. The signature should include the type, such
as::
.. cvar:: PyObject* PyClass_Type
.. describe:: data
Describes global data in a module, including both variables and values used
as "defined constants." Class and object attributes are not documented
using this environment.
.. describe:: exception
Describes an exception class. The signature can, but need not include
parentheses with constructor arguments.
.. describe:: function
Describes a module-level function. The signature should include the
parameters, enclosing optional parameters in brackets. Default values can be
given if it enhances clarity. For example::
.. function:: Timer.repeat([repeat=3[, number=1000000]])
Object methods are not documented using this directive. Bound object methods
placed in the module namespace as part of the public interface of the module
are documented using this, as they are equivalent to normal functions for
most purposes.
The description should include information about the parameters required and
how they are used (especially whether mutable objects passed as parameters
are modified), side effects, and possible exceptions. A small example may be
provided.
.. describe:: class
Describes a class. The signature can include parentheses with parameters
which will be shown as the constructor arguments.
.. describe:: attribute
Describes an object data attribute. The description should include
information about the type of the data to be expected and whether it may be
changed directly.
.. describe:: method
Describes an object method. The parameters should not include the ``self``
parameter. The description should include similar information to that
described for ``function``.
.. describe:: opcode
Describes a Python bytecode instruction.
There is also a generic version of these directives:
.. describe:: describe
This directive produces the same formatting as the specific ones explained
above but does not create index entries or cross-referencing targets. It is
used, for example, to describe the directives in this document. Example::
.. describe:: opcode
Describes a Python bytecode instruction.
Showing code examples
---------------------
Examples of Python source code or interactive sessions are represented using
standard reST literal blocks. They are started by a ``::`` at the end of the
preceding paragraph and delimited by indentation.
Representing an interactive session requires including the prompts and output
along with the Python code. No special markup is required for interactive
sessions. After the last line of input or output presented, there should not be
an "unused" primary prompt; this is an example of what *not* to do::
>>> 1 + 1
2
>>>
Syntax highlighting is handled in a smart way:
* There is a "highlighting language" for each source file. Per default,
this is ``'python'`` as the majority of files will have to highlight Python
snippets.
* Within Python highlighting mode, interactive sessions are recognized
automatically and highlighted appropriately.
* The highlighting language can be changed using the ``highlightlang``
directive, used as follows::
.. highlightlang:: c
This language is used until the next ``highlightlang`` directive is
encountered.
* The valid values for the highlighting language are:
* ``python`` (the default)
* ``c``
* ``rest``
* ``none`` (no highlighting)
* If highlighting with the current language fails, the block is not highlighted
in any way.
Longer displays of verbatim text may be included by storing the example text in
an external file containing only plain text. The file may be included using the
``literalinclude`` directive. [1]_ For example, to include the Python source file
:file:`example.py`, use::
.. literalinclude:: example.py
The file name is relative to the current file's path. Documentation-specific
include files should be placed in the ``Doc/includes`` subdirectory.
Inline markup
-------------
As said before, Sphinx uses interpreted text roles to insert semantic markup in
documents.
Variable names are an exception, they should be marked simply with ``*var*``.
For all other roles, you have to write ``:rolename:`content```.
The following roles refer to objects in modules and are possibly hyperlinked if
a matching identifier is found:
.. describe:: mod
The name of a module; a dotted name may be used. This should also be used for
package names.
.. describe:: func
The name of a Python function; dotted names may be used. The role text
should include trailing parentheses to enhance readability. The parentheses
are stripped when searching for identifiers.
.. describe:: data
The name of a module-level variable.
.. describe:: const
The name of a "defined" constant. This may be a C-language ``#define``
or a Python variable that is not intended to be changed.
.. describe:: class
A class name; a dotted name may be used.
.. describe:: meth
The name of a method of an object. The role text should include the type
name, method name and the trailing parentheses. A dotted name may be used.
.. describe:: attr
The name of a data attribute of an object.
.. describe:: exc
The name of an exception. A dotted name may be used.
The name enclosed in this markup can include a module name and/or a class name.
For example, ``:func:`filter``` could refer to a function named ``filter`` in
the current module, or the built-in function of that name. In contrast,
``:func:`foo.filter``` clearly refers to the ``filter`` function in the ``foo``
module.
A similar heuristic is used to determine whether the name is an attribute of
the currently documented class.
The following roles create cross-references to C-language constructs if they
are defined in the API documentation:
.. describe:: cdata
The name of a C-language variable.
.. describe:: cfunc
The name of a C-language function. Should include trailing parentheses.
.. describe:: cmacro
The name of a "simple" C macro, as defined above.
.. describe:: ctype
The name of a C-language type.
The following role does possibly create a cross-reference, but does not refer
to objects:
.. describe:: token
The name of a grammar token (used in the reference manual to create links
between production displays).
---------
The following roles don't do anything special except formatting the text
in a different style:
.. describe:: command
The name of an OS-level command, such as ``rm``.
.. describe:: dfn
Mark the defining instance of a term in the text. (No index entries are
generated.)
.. describe:: envvar
An environment variable. Index entries are generated.
.. describe:: file
The name of a file or directory. Within the contents, you can use curly
braces to indicate a "variable" part, for example::
... is installed in :file:`/usr/lib/python2.{x}/site-packages` ...
In the built documentation, the ``x`` will be displayed differently to
indicate that it is to be replaced by the Python minor version.
.. describe:: guilabel
Labels presented as part of an interactive user interface should be marked
using ``guilabel``. This includes labels from text-based interfaces such as
those created using :mod:`curses` or other text-based libraries. Any label
used in the interface should be marked with this role, including button
labels, window titles, field names, menu and menu selection names, and even
values in selection lists.
.. describe:: kbd
Mark a sequence of keystrokes. What form the key sequence takes may depend
on platform- or application-specific conventions. When there are no relevant
conventions, the names of modifier keys should be spelled out, to improve
accessibility for new users and non-native speakers. For example, an
*xemacs* key sequence may be marked like ``:kbd:`C-x C-f```, but without
reference to a specific application or platform, the same sequence should be
marked as ``:kbd:`Control-x Control-f```.
.. describe:: keyword
The name of a keyword in a programming language.
.. describe:: mailheader
The name of an RFC 822-style mail header. This markup does not imply that
the header is being used in an email message, but can be used to refer to any
header of the same "style." This is also used for headers defined by the
various MIME specifications. The header name should be entered in the same
way it would normally be found in practice, with the camel-casing conventions
being preferred where there is more than one common usage. For example:
``:mailheader:`Content-Type```.
.. describe:: makevar
The name of a :command:`make` variable.
.. describe:: manpage
A reference to a Unix manual page including the section,
e.g. ``:manpage:`ls(1)```.
.. describe:: menuselection
Menu selections should be marked using the ``menuselection`` role. This is
used to mark a complete sequence of menu selections, including selecting
submenus and choosing a specific operation, or any subsequence of such a
sequence. The names of individual selections should be separated by
``-->``.
For example, to mark the selection "Start > Programs", use this markup::
:menuselection:`Start --> Programs`
When including a selection that includes some trailing indicator, such as the
ellipsis some operating systems use to indicate that the command opens a
dialog, the indicator should be omitted from the selection name.
.. describe:: mimetype
The name of a MIME type, or a component of a MIME type (the major or minor
portion, taken alone).
.. describe:: newsgroup
The name of a Usenet newsgroup.
.. describe:: option
A command-line option to an executable program. The leading hyphen(s) must
be included.
.. describe:: program
The name of an executable program. This may differ from the file name for
the executable for some platforms. In particular, the ``.exe`` (or other)
extension should be omitted for Windows programs.
.. describe:: regexp
A regular expression. Quotes should not be included.
.. describe:: samp
A piece of literal text, such as code. Within the contents, you can use
curly braces to indicate a "variable" part, as in ``:file:``.
If you don't need the "variable part" indication, use the standard
````code```` instead.
.. describe:: var
A Python or C variable or parameter name.
The following roles generate external links:
.. describe:: pep
A reference to a Python Enhancement Proposal. This generates appropriate
index entries. The text "PEP *number*\ " is generated; in the HTML output,
this text is a hyperlink to an online copy of the specified PEP.
.. describe:: rfc
A reference to an Internet Request for Comments. This generates appropriate
index entries. The text "RFC *number*\ " is generated; in the HTML output,
this text is a hyperlink to an online copy of the specified RFC.
Note that there are no special roles for including hyperlinks as you can use
the standard reST markup for that purpose.
.. _doc-ref-role:
Cross-linking markup
--------------------
To support cross-referencing to arbitrary sections in the documentation, the
standard reST labels are "abused" a bit: Every label must precede a section
title; and every label name must be unique throughout the entire documentation
source.
You can then reference to these sections using the ``:ref:`label-name``` role.
Example::
.. _my-reference-label:
Section to cross-reference
--------------------------
This is the text of the section.
It refers to the section itself, see :ref:`my-reference-label`.
The ``:ref:`` invocation is replaced with the section title.
Paragraph-level markup
----------------------
These directives create short paragraphs and can be used inside information
units as well as normal text:
.. describe:: note
An especially important bit of information about an API that a user should be
aware of when using whatever bit of API the note pertains to. The content of
the directive should be written in complete sentences and include all
appropriate punctuation.
Example::
.. note::
This function is not suitable for sending spam e-mails.
.. describe:: warning
An important bit of information about an API that a user should be very aware
of when using whatever bit of API the warning pertains to. The content of
the directive should be written in complete sentences and include all
appropriate punctuation. This differs from ``note`` in that it is recommended
over ``note`` for information regarding security.
.. describe:: versionadded
This directive documents the version of Python which added the described
feature to the library or C API. When this applies to an entire module, it
should be placed at the top of the module section before any prose.
The first argument must be given and is the version in question; you can add
a second argument consisting of a *brief* explanation of the change.
Example::
.. versionadded:: 2.5
The `spam` parameter.
Note that there must be no blank line between the directive head and the
explanation; this is to make these blocks visually continuous in the markup.
.. describe:: versionchanged
Similar to ``versionadded``, but describes when and what changed in the named
feature in some way (new parameters, changed side effects, etc.).
--------------
.. describe:: seealso
Many sections include a list of references to module documentation or
external documents. These lists are created using the ``seealso`` directive.
The ``seealso`` directive is typically placed in a section just before any
sub-sections. For the HTML output, it is shown boxed off from the main flow
of the text.
The content of the ``seealso`` directive should be a reST definition list.
Example::
.. seealso::
Module :mod:`zipfile`
Documentation of the :mod:`zipfile` standard module.
`GNU tar manual, Basic Tar Format <http://link>`_
Documentation for tar archive files, including GNU tar extensions.
.. describe:: rubric
This directive creates a paragraph heading that is not used to create a
table of contents node. It is currently used for the "Footnotes" caption.
.. describe:: centered
This directive creates a centered boldfaced paragraph. Use it as follows::
.. centered::
Paragraph contents.
Table-of-contents markup
------------------------
Since reST does not have facilities to interconnect several documents, or split
documents into multiple output files, Sphinx uses a custom directive to add
relations between the single files the documentation is made of, as well as
tables of contents. The ``toctree`` directive is the central element.
.. describe:: toctree
This directive inserts a "TOC tree" at the current location, using the
individual TOCs (including "sub-TOC trees") of the files given in the
directive body. A numeric ``maxdepth`` option may be given to indicate the
depth of the tree; by default, all levels are included.
Consider this example (taken from the library reference index)::
.. toctree::
:maxdepth: 2
intro.rst
strings.rst
datatypes.rst
numeric.rst
(many more files listed here)
This accomplishes two things:
* Tables of contents from all those files are inserted, with a maximum depth
of two, that means one nested heading. ``toctree`` directives in those
files are also taken into account.
* Sphinx knows that the relative order of the files ``intro.rst``,
``strings.rst`` and so forth, and it knows that they are children of the
shown file, the library index. From this information it generates "next
chapter", "previous chapter" and "parent chapter" links.
In the end, all files included in the build process must occur in one
``toctree`` directive; Sphinx will emit a warning if it finds a file that is
not included, because that means that this file will not be reachable through
standard navigation.
The special file ``contents.rst`` at the root of the source directory is the
"root" of the TOC tree hierarchy; from it the "Contents" page is generated.
Index-generating markup
-----------------------
Sphinx automatically creates index entries from all information units (like
functions, classes or attributes) like discussed before.
However, there is also an explicit directive available, to make the index more
comprehensive and enable index entries in documents where information is not
mainly contained in information units, such as the language reference.
The directive is ``index`` and contains one or more index entries. Each entry
consists of a type and a value, separated by a colon.
For example::
.. index::
single: execution!context
module: __main__
module: sys
triple: module; search; path
This directive contains five entries, which will be converted to entries in the
generated index which link to the exact location of the index statement (or, in
case of offline media, the corresponding page number).
The possible entry types are:
single
Creates a single index entry. Can be made a subentry by separating the
subentry text with a semicolon (this is also used below to describe what
entries are created).
pair
``pair: loop; statement`` is a shortcut that creates two index entries,
namely ``loop; statement`` and ``statement; loop``.
triple
Likewise, ``triple: module; search; path`` is a shortcut that creates three
index entries, which are ``module; search path``, ``search; path, module`` and
``path; module search``.
module, keyword, operator, object, exception, statement, builtin
These all create two index entries. For example, ``module: hashlib`` creates
the entries ``module; hashlib`` and ``hashlib; module``.
Grammar production displays
---------------------------
Special markup is available for displaying the productions of a formal grammar.
The markup is simple and does not attempt to model all aspects of BNF (or any
derived forms), but provides enough to allow context-free grammars to be
displayed in a way that causes uses of a symbol to be rendered as hyperlinks to
the definition of the symbol. There is this directive:
.. describe:: productionlist
This directive is used to enclose a group of productions. Each production is
given on a single line and consists of a name, separated by a colon from the
following definition. If the definition spans multiple lines, each
continuation line must begin with a colon placed at the same column as in the
first line.
Blank lines are not allowed within ``productionlist`` directive arguments.
The definition can contain token names which are marked as interpreted text
(e.g. ``sum ::= `integer` "+" `integer```) -- this generates cross-references
to the productions of these tokens.
Note that no further reST parsing is done in the production, so that you
don't have to escape ``*`` or ``|`` characters.
.. XXX describe optional first parameter
The following is an example taken from the Python Reference Manual::
.. productionlist::
try_stmt: try1_stmt | try2_stmt
try1_stmt: "try" ":" `suite`
: ("except" [`expression` ["," `target`]] ":" `suite`)+
: ["else" ":" `suite`]
: ["finally" ":" `suite`]
try2_stmt: "try" ":" `suite`
: "finally" ":" `suite`
Substitutions
-------------
The documentation system provides three substitutions that are defined by default.
They are set in the build configuration file, see :ref:`doc-build-config`.
.. describe:: |release|
Replaced by the Python release the documentation refers to. This is the full
version string including alpha/beta/release candidate tags, e.g. ``2.5.2b3``.
.. describe:: |version|
Replaced by the Python version the documentation refers to. This consists
only of the major and minor version parts, e.g. ``2.5``, even for version
2.5.1.
.. describe:: |today|
Replaced by either today's date, or the date set in the build configuration
file. Normally has the format ``April 14, 2007``.
.. rubric:: Footnotes
.. [1] There is a standard ``.. include`` directive, but it raises errors if the
file is not found. This one only emits a warning.

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.. highlightlang:: rest
reStructuredText Primer
=======================
This section is a brief introduction to reStructuredText (reST) concepts and
syntax, intended to provide authors with enough information to author documents
productively. Since reST was designed to be a simple, unobtrusive markup
language, this will not take too long.
.. seealso::
The authoritative `reStructuredText User
Documentation <http://docutils.sourceforge.net/rst.html>`_.
Paragraphs
----------
The paragraph is the most basic block in a reST document. Paragraphs are simply
chunks of text separated by one or more blank lines. As in Python, indentation
is significant in reST, so all lines of the same paragraph must be left-aligned
to the same level of indentation.
Inline markup
-------------
The standard reST inline markup is quite simple: use
* one asterisk: ``*text*`` for emphasis (italics),
* two asterisks: ``**text**`` for strong emphasis (boldface), and
* backquotes: ````text```` for code samples.
If asterisks or backquotes appear in running text and could be confused with
inline markup delimiters, they have to be escaped with a backslash.
Be aware of some restrictions of this markup:
* it may not be nested,
* content may not start or end with whitespace: ``* text*`` is wrong,
* it must be separated from surrounding text by non-word characters. Use a
backslash escaped space to work around that: ``thisis\ *one*\ word``.
These restrictions may be lifted in future versions of the docutils.
reST also allows for custom "interpreted text roles"', which signify that the
enclosed text should be interpreted in a specific way. Sphinx uses this to
provide semantic markup and cross-referencing of identifiers, as described in
the appropriate section. The general syntax is ``:rolename:`content```.
Lists and Quotes
----------------
List markup is natural: just place an asterisk at the start of a paragraph and
indent properly. The same goes for numbered lists; they can also be
autonumbered using a ``#`` sign::
* This is a bulleted list.
* It has two items, the second
item uses two lines.
1. This is a numbered list.
2. It has two items too.
#. This is a numbered list.
#. It has two items too.
Note that Sphinx disables the use of enumerated lists introduced by alphabetic
or roman numerals, such as ::
A. First item
B. Second item
Nested lists are possible, but be aware that they must be separated from the
parent list items by blank lines::
* this is
* a list
* with a nested list
* and some subitems
* and here the parent list continues
Definition lists are created as follows::
term (up to a line of text)
Definition of the term, which must be indented
and can even consist of multiple paragraphs
next term
Description.
Paragraphs are quoted by just indenting them more than the surrounding
paragraphs.
Source Code
-----------
Literal code blocks are introduced by ending a paragraph with the special marker
``::``. The literal block must be indented, to be able to include blank lines::
This is a normal text paragraph. The next paragraph is a code sample::
It is not processed in any way, except
that the indentation is removed.
It can span multiple lines.
This is a normal text paragraph again.
The handling of the ``::`` marker is smart:
* If it occurs as a paragraph of its own, that paragraph is completely left
out of the document.
* If it is preceded by whitespace, the marker is removed.
* If it is preceded by non-whitespace, the marker is replaced by a single
colon.
That way, the second sentence in the above example's first paragraph would be
rendered as "The next paragraph is a code sample:".
Hyperlinks
----------
External links
^^^^^^^^^^^^^^
Use ```Link text <http://target>`_`` for inline web links. If the link text
should be the web address, you don't need special markup at all, the parser
finds links and mail addresses in ordinary text.
Internal links
^^^^^^^^^^^^^^
Internal linking is done via a special reST role, see the section on specific
markup, :ref:`doc-ref-role`.
Sections
--------
Section headers are created by underlining (and optionally overlining) the
section title with a punctuation character, at least as long as the text::
=================
This is a heading
=================
Normally, there are no heading levels assigned to certain characters as the
structure is determined from the succession of headings. However, for the
Python documentation, we use this convention:
* ``#`` with overline, for parts
* ``*`` with overline, for chapters
* ``=``, for sections
* ``-``, for subsections
* ``^``, for subsubsections
* ``"``, for paragraphs
Explicit Markup
---------------
"Explicit markup" is used in reST for most constructs that need special
handling, such as footnotes, specially-highlighted paragraphs, comments, and
generic directives.
An explicit markup block begins with a line starting with ``..`` followed by
whitespace and is terminated by the next paragraph at the same level of
indentation. (There needs to be a blank line between explicit markup and normal
paragraphs. This may all sound a bit complicated, but it is intuitive enough
when you write it.)
Directives
----------
A directive is a generic block of explicit markup. Besides roles, it is one of
the extension mechanisms of reST, and Sphinx makes heavy use of it.
Basically, a directive consists of a name, arguments, options and content. (Keep
this terminology in mind, it is used in the next chapter describing custom
directives.) Looking at this example, ::
.. function:: foo(x)
foo(y, z)
:bar: no
Return a line of text input from the user.
``function`` is the directive name. It is given two arguments here, the
remainder of the first line and the second line, as well as one option ``bar``
(as you can see, options are given in the lines immediately following the
arguments and indicated by the colons).
The directive content follows after a blank line and is indented relative to the
directive start.
Footnotes
---------
For footnotes, use ``[#]_`` to mark the footnote location, and add the footnote
body at the bottom of the document after a "Footnotes" rubric heading, like so::
Lorem ipsum [#]_ dolor sit amet ... [#]_
.. rubric:: Footnotes
.. [#] Text of the first footnote.
.. [#] Text of the second footnote.
You can also explicitly number the footnotes for better context.
Comments
--------
Every explicit markup block which isn't a valid markup construct (like the
footnotes above) is regarded as a comment.
Source encoding
---------------
Since the easiest way to include special characters like em dashes or copyright
signs in reST is to directly write them as Unicode characters, one has to
specify an encoding:
All Python documentation source files must be in UTF-8 encoding, and the HTML
documents written from them will be in that encoding as well.
Gotchas
-------
There are some problems one commonly runs into while authoring reST documents:
* **Separation of inline markup:** As said above, inline markup spans must be
separated from the surrounding text by non-word characters, you have to use
an escaped space to get around that.
.. XXX more?

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The Sphinx build system
=======================
.. XXX: intro...
.. _doc-build-config:
The build configuration file
----------------------------
The documentation root, that is the ``Doc`` subdirectory of the source
distribution, contains a file named ``conf.py``. This file is called the "build
configuration file", and it contains several variables that are read and used
during a build run.
These variables are:
version : string
A string that is used as a replacement for the ``|version|`` reST
substitution. It should be the Python version the documentation refers to.
This consists only of the major and minor version parts, e.g. ``2.5``, even
for version 2.5.1.
release : string
A string that is used as a replacement for the ``|release|`` reST
substitution. It should be the full version string including
alpha/beta/release candidate tags, e.g. ``2.5.2b3``.
Both ``release`` and ``version`` can be ``'auto'``, which means that they are
determined at runtime from the ``Include/patchlevel.h`` file, if a complete
Python source distribution can be found, or else from the interpreter running
Sphinx.
today_fmt : string
A ``strftime`` format that is used to format a replacement for the
``|today|`` reST substitution.
today : string
A string that can contain a date that should be written to the documentation
output literally. If this is nonzero, it is used instead of
``strftime(today_fmt)``.
unused_files : list of strings
A list of reST filenames that are to be disregarded during building. This
could be docs for temporarily disabled modules or documentation that's not
yet ready for public consumption.
last_updated_format : string
If this is not an empty string, it will be given to ``time.strftime()`` and
written to each generated output file after "last updated on:".
use_smartypants : bool
If true, use SmartyPants to convert quotes and dashes to the typographically
correct entities.
add_function_parentheses : bool
If true, ``()`` will be appended to the content of ``:func:``, ``:meth:`` and
``:cfunc:`` cross-references.

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Style Guide
===========
The Python documentation should follow the `Apple Publications Style Guide`_
wherever possible. This particular style guide was selected mostly because it
seems reasonable and is easy to get online.
Topics which are not covered in the Apple's style guide will be discussed in
this document.
All reST files use an indentation of 3 spaces. The maximum line length is 80
characters for normal text, but tables, deeply indented code samples and long
links may extend beyond that.
Make generous use of blank lines where applicable; they help grouping things
together.
A sentence-ending period may be followed by one or two spaces; while reST
ignores the second space, it is customarily put in by some users, for example
to aid Emacs' auto-fill mode.
Footnotes are generally discouraged, though they may be used when they are the
best way to present specific information. When a footnote reference is added at
the end of the sentence, it should follow the sentence-ending punctuation. The
reST markup should appear something like this::
This sentence has a footnote reference. [#]_ This is the next sentence.
Footnotes should be gathered at the end of a file, or if the file is very long,
at the end of a section. The docutils will automatically create backlinks to
the footnote reference.
Footnotes may appear in the middle of sentences where appropriate.
Many special names are used in the Python documentation, including the names of
operating systems, programming languages, standards bodies, and the like. Most
of these entities are not assigned any special markup, but the preferred
spellings are given here to aid authors in maintaining the consistency of
presentation in the Python documentation.
Other terms and words deserve special mention as well; these conventions should
be used to ensure consistency throughout the documentation:
CPU
For "central processing unit." Many style guides say this should be spelled
out on the first use (and if you must use it, do so!). For the Python
documentation, this abbreviation should be avoided since there's no
reasonable way to predict which occurrence will be the first seen by the
reader. It is better to use the word "processor" instead.
POSIX
The name assigned to a particular group of standards. This is always
uppercase.
Python
The name of our favorite programming language is always capitalized.
Unicode
The name of a character set and matching encoding. This is always written
capitalized.
Unix
The name of the operating system developed at AT&T Bell Labs in the early
1970s.
.. _Apple Publications Style Guide: http://developer.apple.com/documentation/UserExperience/Conceptual/APStyleGuide/AppleStyleGuide2003.pdf