symbian-qemu-0.9.1-12/python-2.6.1/Doc/distutils/introduction.rst
author martin.trojer@nokia.com
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.. _distutils-intro:
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An Introduction to Distutils
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This document covers using the Distutils to distribute your Python modules,
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concentrating on the role of developer/distributor: if you're looking for
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information on installing Python modules, you should refer to the
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:ref:`install-index` chapter.
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.. _distutils-concepts:
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Concepts & Terminology
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======================
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Using the Distutils is quite simple, both for module developers and for
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users/administrators installing third-party modules.  As a developer, your
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responsibilities (apart from writing solid, well-documented and well-tested
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code, of course!) are:
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* write a setup script (:file:`setup.py` by convention)
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* (optional) write a setup configuration file
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* create a source distribution
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* (optional) create one or more built (binary) distributions
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Each of these tasks is covered in this document.
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Not all module developers have access to a multitude of platforms, so it's not
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always feasible to expect them to create a multitude of built distributions.  It
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is hoped that a class of intermediaries, called *packagers*, will arise to
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address this need.  Packagers will take source distributions released by module
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developers, build them on one or more platforms, and release the resulting built
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distributions.  Thus, users on the most popular platforms will be able to
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install most popular Python module distributions in the most natural way for
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their platform, without having to run a single setup script or compile a line of
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code.
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.. _distutils-simple-example:
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A Simple Example
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================
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The setup script is usually quite simple, although since it's written in Python,
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there are no arbitrary limits to what you can do with it, though you should be
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careful about putting arbitrarily expensive operations in your setup script.
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Unlike, say, Autoconf-style configure scripts, the setup script may be run
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multiple times in the course of building and installing your module
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distribution.
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If all you want to do is distribute a module called :mod:`foo`, contained in a
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file :file:`foo.py`, then your setup script can be as simple as this::
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   from distutils.core import setup
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   setup(name='foo',
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         version='1.0',
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         py_modules=['foo'],
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         )
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Some observations:
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* most information that you supply to the Distutils is supplied as keyword
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  arguments to the :func:`setup` function
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* those keyword arguments fall into two categories: package metadata (name,
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  version number) and information about what's in the package (a list of pure
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  Python modules, in this case)
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* modules are specified by module name, not filename (the same will hold true
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  for packages and extensions)
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* it's recommended that you supply a little more metadata, in particular your
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  name, email address and a URL for the project (see section :ref:`setup-script`
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  for an example)
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To create a source distribution for this module, you would create a setup
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script, :file:`setup.py`, containing the above code, and run::
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   python setup.py sdist
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which will create an archive file (e.g., tarball on Unix, ZIP file on Windows)
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containing your setup script :file:`setup.py`, and your module :file:`foo.py`.
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The archive file will be named :file:`foo-1.0.tar.gz` (or :file:`.zip`), and
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will unpack into a directory :file:`foo-1.0`.
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If an end-user wishes to install your :mod:`foo` module, all she has to do is
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download :file:`foo-1.0.tar.gz` (or :file:`.zip`), unpack it, and---from the
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:file:`foo-1.0` directory---run ::
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   python setup.py install
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which will ultimately copy :file:`foo.py` to the appropriate directory for
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third-party modules in their Python installation.
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This simple example demonstrates some fundamental concepts of the Distutils.
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First, both developers and installers have the same basic user interface, i.e.
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the setup script.  The difference is which Distutils *commands* they use: the
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:command:`sdist` command is almost exclusively for module developers, while
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:command:`install` is more often for installers (although most developers will
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want to install their own code occasionally).
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If you want to make things really easy for your users, you can create one or
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more built distributions for them.  For instance, if you are running on a
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Windows machine, and want to make things easy for other Windows users, you can
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create an executable installer (the most appropriate type of built distribution
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for this platform) with the :command:`bdist_wininst` command.  For example::
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   python setup.py bdist_wininst
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will create an executable installer, :file:`foo-1.0.win32.exe`, in the current
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directory.
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Other useful built distribution formats are RPM, implemented by the
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:command:`bdist_rpm` command, Solaris :program:`pkgtool`
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(:command:`bdist_pkgtool`), and HP-UX :program:`swinstall`
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(:command:`bdist_sdux`).  For example, the following command will create an RPM
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file called :file:`foo-1.0.noarch.rpm`::
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   python setup.py bdist_rpm
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(The :command:`bdist_rpm` command uses the :command:`rpm` executable, therefore
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this has to be run on an RPM-based system such as Red Hat Linux, SuSE Linux, or
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Mandrake Linux.)
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You can find out what distribution formats are available at any time by running
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::
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   python setup.py bdist --help-formats
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.. _python-terms:
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General Python terminology
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==========================
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If you're reading this document, you probably have a good idea of what modules,
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extensions, and so forth are.  Nevertheless, just to be sure that everyone is
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operating from a common starting point, we offer the following glossary of
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common Python terms:
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module
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   the basic unit of code reusability in Python: a block of code imported by some
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   other code.  Three types of modules concern us here: pure Python modules,
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   extension modules, and packages.
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pure Python module
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   a module written in Python and contained in a single :file:`.py` file (and
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   possibly associated :file:`.pyc` and/or :file:`.pyo` files).  Sometimes referred
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   to as a "pure module."
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extension module
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   a module written in the low-level language of the Python implementation: C/C++
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   for Python, Java for Jython. Typically contained in a single dynamically
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   loadable pre-compiled file, e.g. a shared object (:file:`.so`) file for Python
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   extensions on Unix, a DLL (given the :file:`.pyd` extension) for Python
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   extensions on Windows, or a Java class file for Jython extensions.  (Note that
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   currently, the Distutils only handles C/C++ extensions for Python.)
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package
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   a module that contains other modules; typically contained in a directory in the
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   filesystem and distinguished from other directories by the presence of a file
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   :file:`__init__.py`.
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root package
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   the root of the hierarchy of packages.  (This isn't really a package, since it
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   doesn't have an :file:`__init__.py` file.  But we have to call it something.)
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   The vast majority of the standard library is in the root package, as are many
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   small, standalone third-party modules that don't belong to a larger module
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   collection. Unlike regular packages, modules in the root package can be found in
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   many directories: in fact, every directory listed in ``sys.path`` contributes
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   modules to the root package.
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.. _distutils-term:
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Distutils-specific terminology
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==============================
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The following terms apply more specifically to the domain of distributing Python
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modules using the Distutils:
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module distribution
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   a collection of Python modules distributed together as a single downloadable
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   resource and meant to be installed *en masse*.  Examples of some well-known
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   module distributions are Numeric Python, PyXML, PIL (the Python Imaging
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   Library), or mxBase.  (This would be called a *package*, except that term is
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   already taken in the Python context: a single module distribution may contain
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   zero, one, or many Python packages.)
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pure module distribution
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   a module distribution that contains only pure Python modules and packages.
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   Sometimes referred to as a "pure distribution."
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non-pure module distribution
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   a module distribution that contains at least one extension module.  Sometimes
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   referred to as a "non-pure distribution."
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distribution root
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   the top-level directory of your source tree (or  source distribution); the
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   directory where :file:`setup.py` exists.  Generally  :file:`setup.py` will be
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   run from this directory.
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