mirror of
https://github.com/Zeckmathederg/glfs.git
synced 2025-01-26 08:42:12 +08:00
78af2ee0fd
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@23550 af4574ff-66df-0310-9fd7-8a98e5e911e0
395 lines
13 KiB
XML
395 lines
13 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY python3-download-http
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"https://www.python.org/ftp/python/&python3-version;/Python-&python3-version;.tar.xz">
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<!ENTITY python3-download-ftp " ">
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<!ENTITY python3-md5sum "35b5a3d0254c1c59be9736373d429db7">
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<!ENTITY python3-size "17 MB">
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<!ENTITY python3-buildsize "187 MB (add 27 MB for tests)">
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<!ENTITY python3-time "0.5 SBU (using parallelism=4; add 2.1 SBU for tests, including rebuilding)">
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<!--
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Note: Size does not reflect docs that were install in LFS.
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<!ENTITY python3htmldoc-download-http
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"https://docs.python.org/ftp/python/doc/&python3-version;/python-&python3-version;-docs-html.tar.bz2"> -->
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]>
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<sect1 id="python3" xreflabel="Python-&python3-version;">
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<?dbhtml filename="python3.html" ?>
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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</sect1info>
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<title>Python-&python3-version;</title>
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<indexterm zone="python3">
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<primary sortas="a-Python3">Python3</primary>
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</indexterm>
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<sect2 role="package">
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<title>Introduction to Python 3</title>
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<para>
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The <application>Python 3</application> package contains the
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<application>Python</application> development environment.
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This is useful for object-oriented programming, writing scripts,
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prototyping large programs or developing entire applications.
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</para>
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<note>
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<para>
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<application>Python 3</application> was installed in LFS.
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The only reason to rebuild it here is if optional modules
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are needed.
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</para>
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</note>
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&lfs10_checked;
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<bridgehead renderas="sect3">Package Information</bridgehead>
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<itemizedlist spacing="compact">
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<listitem>
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<para>
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Download (HTTP): <ulink url="&python3-download-http;"/>
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</para>
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</listitem>
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<listitem>
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<para>
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Download (FTP): <ulink url="&python3-download-ftp;"/>
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</para>
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</listitem>
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<listitem>
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<para>
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Download MD5 sum: &python3-md5sum;
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</para>
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</listitem>
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<listitem>
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<para>
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Download size: &python3-size;
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</para>
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</listitem>
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<listitem>
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<para>
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Estimated disk space required: &python3-buildsize;
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</para>
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</listitem>
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<listitem>
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<para>
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Estimated build time: &python3-time;
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</para>
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</listitem>
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</itemizedlist>
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<bridgehead renderas="sect3">Python 3 Dependencies</bridgehead>
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<bridgehead renderas="sect4">Recommended</bridgehead>
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<para role="recommended">
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<xref linkend="sqlite"/> (required if building firefox)
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</para>
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<bridgehead renderas="sect4">Optional</bridgehead>
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<para role="optional">
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<xref linkend="bluez"/>,
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<xref linkend="gdb"/> (required for some tests),
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<xref linkend="valgrind"/>, and
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<ulink url="http://www.bytereef.org/mpdecimal">libmpdec</ulink>
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</para>
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<bridgehead renderas="sect4">Optional (For Additional Modules)</bridgehead>
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<para role="optional">
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<xref linkend="db"/> and
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<xref linkend="tk"/>
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</para>
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<para condition="html" role="usernotes">User Notes:
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<ulink url="&blfs-wiki;/Python3"/>
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</para>
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</sect2>
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<sect2 role="installation">
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<title>Installation of Python 3</title>
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<para>
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Install <application>Python 3</application> by running the following
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commands:
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</para>
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<screen><userinput>CXX="/usr/bin/g++" \
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./configure --prefix=/usr \
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--enable-shared \
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--with-system-expat \
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--with-system-ffi \
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--with-ensurepip=yes &&
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make</userinput></screen>
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<para>
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The test suite must be run separately, using an X terminal (see below).
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</para>
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<para>
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Now, as the <systemitem class="username">root</systemitem> user:
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</para>
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<screen role="root"><userinput>make install &&
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<!--ln -sfv pip&python3-majorver; /usr/bin/pip3 &&-->
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chmod -v 755 /usr/lib/libpython&python3-majorver;.so &&
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chmod -v 755 /usr/lib/libpython3.so</userinput></screen>
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<para>
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The test suite must be run separately from the build, either before or
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after the package is built and installed. Do not run
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<command>make install</command> after running the test suite. To build
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and install the package, you need to start with a fresh or clean source
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tree. For the tests, you also need a clean source code, so either start by
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removing the source code directory and starting over, by uncompressing
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the source tarball or by running <command>make clean</command>. Then
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configure again, adding <quote>--with-pydebug</quote> to the
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<command>configure</command> switches above, run <command>make</command>,
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then <command>make test</command>. Remember that tests must be executed
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using an X terminal.
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The test SBU highly depends on the speed of the internet connection.
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The test_sqlite test is known to fail.
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</para>
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</sect2>
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<sect2 role="commands">
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<title>Command Explanations</title>
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<para>
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<command> CXX="/usr/bin/g++" ./configure ...</command>: Avoid an annoying
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message during configuration.
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</para>
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<para>
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<parameter>--with-system-expat</parameter>: This switch enables linking
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against the system version of <application>Expat</application>.
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</para>
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<para>
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<parameter>--with-system-ffi</parameter>: This switch enables linking
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against system version of <application>libffi</application>.
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</para>
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<para>
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<parameter>--with-ensurepip=yes</parameter> : This switch enables building
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<command>pip</command> and <command>setuptools</command> packaging programs.
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<command>setuptools</command> is needed for building some Python modules.
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</para>
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<para>
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<option>--with-dbmliborder=bdb:gdbm:ndbm</option>: Use this switch
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if you want to build <application>Python</application> DBM Module
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against <application>Berkeley DB</application> instead of
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<application>GDBM</application>.
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</para>
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<para>
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<option>--enable-optimization</option>: Use this switch
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if you want to enable <emphasis>expensive</emphasis> optimizations (i.e.
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Profile Guided Optimizations). This adds around 20 SBU, but can
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<emphasis>slightly</emphasis> speed up some uses, such as using
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<application>Sphinx</application> for creating documentation, or use of
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<application>Python3</application> scripts.
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</para>
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<para>
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<option>--with-lto</option>: This optional switch enables thick Link
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Time Optimization. Unusually, it creates a much larger <filename
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class="libraryfile">/usr/lib/python&python3-majorver;/config-&python3-majorver;-<arch>-linux-gnu/libpython&python3-majorver;.a</filename>
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with a small increase in the time to compile
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<application>Python</application>. Run-time results do not appear to show
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any benefit from doing this.
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</para>
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<!--
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<para>
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<command>ln -sfv ...</command>: When upgrading to Python-3.8, it was
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discovered that the symlink to pip3 is sometimes not created. Create
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the symlink so that pip3 can be used as described in the book.
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</para>
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-->
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<para>
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<command>chmod ...</command>: Fix permissions for shared libraries to be
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consistent with other libraries.
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</para>
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</sect2>
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<sect2 role="configuration">
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<title>Configuring Python 3</title>
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<para>
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In order for <command>python3</command> to find the installed
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documentation, create the following version independent symlink:
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</para>
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<screen role="root"><userinput>ln -svfn python-&python3-version; /usr/share/doc/python-3</userinput></screen>
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<para>
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and add the following environment variable to the individual user's or
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system's profile:
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</para>
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<screen role="root"><userinput>export PYTHONDOCS=/usr/share/doc/python-3/html</userinput></screen>
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</sect2>
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<sect2 role="content">
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<title>Contents</title>
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<segmentedlist>
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<segtitle>Installed Programs</segtitle>
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<segtitle>Installed Libraries</segtitle>
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<segtitle>Installed Directories</segtitle>
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<seglistitem>
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<seg>
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2to3 (symlink) and
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2to3-&python3-majorver;,
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easy_install (symlink) and
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easy_install-&python3-majorver;,
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idle3 (symlink) and
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idle&python3-majorver;,
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pip3 (symlink) and
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pip&python3-majorver;,
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pydoc3 (symlink) and
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pydoc&python3-majorver;,
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python3 (symlink);
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python&python3-majorver;, and
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python3-config (symlink) and
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python&python3-majorver;-config
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<!--
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pyvenv (symlink),
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pyvenv-&python3-majorver;
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-->
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</seg>
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<seg>
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libpython&python3-majorver;.so and libpython3.so
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</seg>
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<seg>
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/usr/include/python&python3-majorver;,
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/usr/lib/python&python3-majorver;, and
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/usr/share/doc/python-&python3-version;
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</seg>
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</seglistitem>
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</segmentedlist>
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<variablelist>
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<bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<!--
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<varlistentry id="2to3">
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<term><command>2to3</command></term>
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<listitem>
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<para>
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is designed to assist in the transition between python2 and python3
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by automatically converting code to be Python3 compatible.
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</para>
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<indexterm zone="python3 2to3">
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<primary sortas="b-2to3">2to3</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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Put here for easy use when removing Python2 -->
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<varlistentry id="easy_install">
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<term><command>easy_install</command></term>
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<listitem>
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<para>
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is a frontend to pip3 to make it easier to configure python modules
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through the PIP package manager.
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</para>
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<indexterm zone="python3 easy_install">
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<primary sortas="python3 easy_install">easy_install</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="idle3">
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<term><command>idle3</command></term>
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<listitem>
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<para>
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is a wrapper script that opens a <application>Python</application>
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aware GUI editor. For this script to run, you must have installed
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<application>Tk</application> before Python so that the Tkinter
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Python module is built.
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</para>
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<indexterm zone="python3 idle3">
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<primary sortas="b-idle3">idle3</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="pydoc3">
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<term><command>pydoc3</command></term>
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<listitem>
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<para>
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is the <application>Python</application> documentation
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tool.
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</para>
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<indexterm zone="python3 pydoc3">
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<primary sortas="b-pydoc3">pydo3c</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="python3-prog">
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<term><command>python3</command></term>
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<listitem>
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<para>
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is an interpreted, interactive, object-oriented programming
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language.
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</para>
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<indexterm zone="python3 python3-prog">
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<primary sortas="b-python3">python3</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="python-ver">
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<term><command>python&python3-majorver;</command></term>
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<listitem>
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<para>
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is a version-specific name for the <command>python</command>
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program.
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</para>
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<indexterm zone="python3 python-ver">
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<primary
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sortas="b-python&python3-majorver;">python&python3-majorver;</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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<!--
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<varlistentry id="pyvenv">
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<term><command>pyvenv</command></term>
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<listitem>
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<para>
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creates virtual <application>Python</application> environments in
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one or more target directories.
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</para>
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<indexterm zone="python3 pyvenv">
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<primary
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sortas="b-python&python3-majorver;">python&python3-majorver;</primary>
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</indexterm>
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</listitem>
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</varlistentry>
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-->
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</variablelist>
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</sect2>
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</sect1>
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