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.. highlight:: sh
.. _using-on-unix:
********************************
Using Python on Unix platforms
********************************
.. sectionauthor:: Shriphani Palakodety
Getting and installing the latest version of Python
===================================================
On Linux
--------
Python comes preinstalled on most Linux distributions, and is available as a
package on all others. However there are certain features you might want to use
that are not available on your distro's package. You can easily compile the
latest version of Python from source.
In the event that Python doesn't come preinstalled and isn't in the repositories as
well, you can easily make packages for your own distro. Have a look at the
following links:
.. seealso::
https://www.debian.org/doc/manuals/maint-guide/first.en.html
for Debian users
https://en.opensuse.org/Portal:Packaging
for OpenSuse users
https://docs-old.fedoraproject.org/en-US/Fedora_Draft_Documentation/0.1/html/RPM_Guide/ch-creating-rpms.html
for Fedora users
http://www.slackbook.org/html/package-management-making-packages.html
for Slackware users
On FreeBSD and OpenBSD
----------------------
* FreeBSD users, to add the package use::
pkg install python3
* OpenBSD users, to add the package use::
pkg_add -r python
pkg_add ftp://ftp.openbsd.org/pub/OpenBSD/4.2/packages/<insert your architecture here>/python-<version>.tgz
For example i386 users get the 2.5.1 version of Python using::
pkg_add ftp://ftp.openbsd.org/pub/OpenBSD/4.2/packages/i386/python-2.5.1p2.tgz
On OpenSolaris
--------------
You can get Python from `OpenCSW <https://www.opencsw.org/>`_. Various versions
of Python are available and can be installed with e.g. ``pkgutil -i python27``.
.. _building-python-on-unix:
Building Python
===============
If you want to compile CPython yourself, first thing you should do is get the
`source <https://www.python.org/downloads/source/>`_. You can download either the
latest release's source or just grab a fresh `clone
<https://devguide.python.org/setup/#getting-the-source-code>`_. (If you want
to contribute patches, you will need a clone.)
The build process consists of the usual commands::
./configure
make
make install
Configuration options and caveats for specific Unix platforms are extensively
documented in the :source:`README.rst` file in the root of the Python source
tree.
.. warning::
``make install`` can overwrite or masquerade the :file:`python3` binary.
``make altinstall`` is therefore recommended instead of ``make install``
since it only installs :file:`{exec_prefix}/bin/python{version}`.
Python-related paths and files
==============================
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/python3` | 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. |
+-----------------------------------------------+------------------------------------------+
Miscellaneous
=============
To easily use Python scripts on Unix, you need to make them executable,
e.g. with
.. code-block:: shell-session
$ chmod +x script
and put an appropriate Shebang line at the top of the script. A good choice is
usually ::
#!/usr/bin/env python3
which searches for the Python interpreter in the whole :envvar:`PATH`. However,
some Unices may not have the :program:`env` command, so you may need to hardcode
``/usr/bin/python3`` as the interpreter path.
To use shell commands in your Python scripts, look at the :mod:`subprocess` module.
|
