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 Installing Python Modules chapter.
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:
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.
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 foo, contained in a 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'], )
To create a source distribution for this module, you would create a setup script, setup.py, containing the above code, and run this command from a terminal:
python setup.py sdist
For Windows, open a command prompt windows (Start ‣ Accessories) and change the command to:
sdist will create an archive file (e.g., tarball on Unix, ZIP file on Windows) containing your setup script setup.py, and your module foo.py. The archive file will be named foo-1.0.tar.gz (or .zip), and will unpack into a directory foo-1.0.
If an end-user wishes to install your foo module, all she has to do is download foo-1.0.tar.gz (or .zip), unpack it, and—from the foo-1.0 directory—run
python setup.py install
which will ultimately copy 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 sdist command is almost exclusively for module developers, while 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 bdist_wininst command. For example:
python setup.py bdist_wininst
will create an executable installer, foo-1.0.win32.exe, in the current directory.
Other useful built distribution formats are RPM, implemented by the bdist_rpm command, Solaris pkgtool (bdist_pkgtool), and HP-UX swinstall (bdist_sdux). For example, the following command will create an RPM file called foo-1.0.noarch.rpm:
python setup.py bdist_rpm
(The bdist_rpm command uses the 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
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:
The following terms apply more specifically to the domain of distributing Python modules using the Distutils: