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author | Georg Brandl <georg@python.org> | 2007-08-15 14:28:22 (GMT) |
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committer | Georg Brandl <georg@python.org> | 2007-08-15 14:28:22 (GMT) |
commit | 116aa62bf54a39697e25f21d6cf6799f7faa1349 (patch) | |
tree | 8db5729518ed4ca88e26f1e26cc8695151ca3eb3 /Doc/distutils/introduction.rst | |
parent | 739c01d47b9118d04e5722333f0e6b4d0c8bdd9e (diff) | |
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Move the 3k reST doc tree in place.
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diff --git a/Doc/distutils/introduction.rst b/Doc/distutils/introduction.rst new file mode 100644 index 0000000..b772b01 --- /dev/null +++ b/Doc/distutils/introduction.rst @@ -0,0 +1,208 @@ +.. _distutils-intro: + +**************************** +An Introduction to Distutils +**************************** + +This document covers using the Distutils to distribute your Python modules, +concentrating on the role of developer/distributor: if you're looking for +information on installing Python modules, you should refer to the +:ref:`install-index` chapter. + + +.. _distutils-concepts: + +Concepts & Terminology +====================== + +Using the Distutils is quite simple, both for module developers and for +users/administrators installing third-party modules. As a developer, your +responsibilities (apart from writing solid, well-documented and well-tested +code, of course!) are: + +* write a setup script (:file:`setup.py` by convention) + +* (optional) write a setup configuration file + +* create a source distribution + +* (optional) create one or more built (binary) distributions + +Each of these tasks is covered in this document. + +Not all module developers have access to a multitude of platforms, so it's not +always feasible to expect them to create a multitude of built distributions. It +is hoped that a class of intermediaries, called *packagers*, will arise to +address this need. Packagers will take source distributions released by module +developers, build them on one or more platforms, and release the resulting built +distributions. Thus, users on the most popular platforms will be able to +install most popular Python module distributions in the most natural way for +their platform, without having to run a single setup script or compile a line of +code. + + +.. _distutils-simple-example: + +A Simple Example +================ + +The setup script is usually quite simple, although since it's written in Python, +there are no arbitrary limits to what you can do with it, though you should be +careful about putting arbitrarily expensive operations in your setup script. +Unlike, say, Autoconf-style configure scripts, the setup script may be run +multiple times in the course of building and installing your module +distribution. + +If all you want to do is distribute a module called :mod:`foo`, contained in a +file :file:`foo.py`, then your setup script can be as simple as this:: + + from distutils.core import setup + setup(name='foo', + version='1.0', + py_modules=['foo'], + ) + +Some observations: + +* most information that you supply to the Distutils is supplied as keyword + arguments to the :func:`setup` function + +* those keyword arguments fall into two categories: package metadata (name, + version number) and information about what's in the package (a list of pure + Python modules, in this case) + +* modules are specified by module name, not filename (the same will hold true + for packages and extensions) + +* it's recommended that you supply a little more metadata, in particular your + name, email address and a URL for the project (see section :ref:`setup-script` + for an example) + +To create a source distribution for this module, you would create a setup +script, :file:`setup.py`, containing the above code, and run:: + + python setup.py sdist + +which will create an archive file (e.g., tarball on Unix, ZIP file on Windows) +containing your setup script :file:`setup.py`, and your module :file:`foo.py`. +The archive file will be named :file:`foo-1.0.tar.gz` (or :file:`.zip`), and +will unpack into a directory :file:`foo-1.0`. + +If an end-user wishes to install your :mod:`foo` module, all she has to do is +download :file:`foo-1.0.tar.gz` (or :file:`.zip`), unpack it, and---from the +:file:`foo-1.0` directory---run :: + + python setup.py install + +which will ultimately copy :file:`foo.py` to the appropriate directory for +third-party modules in their Python installation. + +This simple example demonstrates some fundamental concepts of the Distutils. +First, both developers and installers have the same basic user interface, i.e. +the setup script. The difference is which Distutils *commands* they use: the +:command:`sdist` command is almost exclusively for module developers, while +:command:`install` is more often for installers (although most developers will +want to install their own code occasionally). + +If you want to make things really easy for your users, you can create one or +more built distributions for them. For instance, if you are running on a +Windows machine, and want to make things easy for other Windows users, you can +create an executable installer (the most appropriate type of built distribution +for this platform) with the :command:`bdist_wininst` command. For example:: + + python setup.py bdist_wininst + +will create an executable installer, :file:`foo-1.0.win32.exe`, in the current +directory. + +Other useful built distribution formats are RPM, implemented by the +:command:`bdist_rpm` command, Solaris :program:`pkgtool` +(:command:`bdist_pkgtool`), and HP-UX :program:`swinstall` +(:command:`bdist_sdux`). For example, the following command will create an RPM +file called :file:`foo-1.0.noarch.rpm`:: + + python setup.py bdist_rpm + +(The :command:`bdist_rpm` command uses the :command:`rpm` executable, therefore +this has to be run on an RPM-based system such as Red Hat Linux, SuSE Linux, or +Mandrake Linux.) + +You can find out what distribution formats are available at any time by running +:: + + python setup.py bdist --help-formats + + +.. _python-terms: + +General Python terminology +========================== + +If you're reading this document, you probably have a good idea of what modules, +extensions, and so forth are. Nevertheless, just to be sure that everyone is +operating from a common starting point, we offer the following glossary of +common Python terms: + +module + the basic unit of code reusability in Python: a block of code imported by some + other code. Three types of modules concern us here: pure Python modules, + extension modules, and packages. + +pure Python module + a module written in Python and contained in a single :file:`.py` file (and + possibly associated :file:`.pyc` and/or :file:`.pyo` files). Sometimes referred + to as a "pure module." + +extension module + a module written in the low-level language of the Python implementation: C/C++ + for Python, Java for Jython. Typically contained in a single dynamically + loadable pre-compiled file, e.g. a shared object (:file:`.so`) file for Python + extensions on Unix, a DLL (given the :file:`.pyd` extension) for Python + extensions on Windows, or a Java class file for Jython extensions. (Note that + currently, the Distutils only handles C/C++ extensions for Python.) + +package + a module that contains other modules; typically contained in a directory in the + filesystem and distinguished from other directories by the presence of a file + :file:`__init__.py`. + +root package + the root of the hierarchy of packages. (This isn't really a package, since it + doesn't have an :file:`__init__.py` file. But we have to call it something.) + The vast majority of the standard library is in the root package, as are many + small, standalone third-party modules that don't belong to a larger module + collection. Unlike regular packages, modules in the root package can be found in + many directories: in fact, every directory listed in ``sys.path`` contributes + modules to the root package. + + +.. _distutils-term: + +Distutils-specific terminology +============================== + +The following terms apply more specifically to the domain of distributing Python +modules using the Distutils: + +module distribution + a collection of Python modules distributed together as a single downloadable + resource and meant to be installed *en masse*. Examples of some well-known + module distributions are Numeric Python, PyXML, PIL (the Python Imaging + Library), or mxBase. (This would be called a *package*, except that term is + already taken in the Python context: a single module distribution may contain + zero, one, or many Python packages.) + +pure module distribution + a module distribution that contains only pure Python modules and packages. + Sometimes referred to as a "pure distribution." + +non-pure module distribution + a module distribution that contains at least one extension module. Sometimes + referred to as a "non-pure distribution." + +distribution root + the top-level directory of your source tree (or source distribution); the + directory where :file:`setup.py` exists. Generally :file:`setup.py` will be + run from this directory. + + |