| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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| 7 | <!ENTITY python3-download-http
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| 8 | "https://www.python.org/ftp/python/&python3-version;/Python-&python3-version;.tar.xz">
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| 9 | <!ENTITY python3-download-ftp " ">
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| 10 | <!ENTITY python3-md5sum "e9d6ebc92183a177b8e8a58cad5b8d67">
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| 11 | <!ENTITY python3-size "17 MB">
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| 12 | <!ENTITY python3-buildsize "193 MB (add 27 MB for tests)">
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| 13 | <!ENTITY python3-time "0.5 SBU (using parallelism=4; add 1.6 SBU for tests, including rebuilding)">
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| 14 | <!--
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| 15 |
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| 16 | Note: Size does not reflect docs that were install in LFS.
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| 17 |
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| 18 | <!ENTITY python3htmldoc-download-http
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| 19 | "https://docs.python.org/ftp/python/doc/&python3-version;/python-&python3-version;-docs-html.tar.bz2"> -->
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| 20 | ]>
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| 21 |
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| 22 | <sect1 id="python3" xreflabel="Python-&python3-version;">
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| 23 | <?dbhtml filename="python3.html" ?>
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| 24 |
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| 25 | <sect1info>
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| 26 | <othername>$LastChangedBy$</othername>
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| 27 | <date>$Date$</date>
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| 28 | </sect1info>
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| 29 |
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| 30 | <title>Python-&python3-version;</title>
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| 31 |
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| 32 | <indexterm zone="python3">
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| 33 | <primary sortas="a-Python3">Python3</primary>
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| 34 | </indexterm>
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| 35 |
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| 36 | <sect2 role="package">
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| 37 | <title>Introduction to Python 3</title>
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| 38 |
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| 39 | <para>
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| 40 | The <application>Python 3</application> package contains the
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| 41 | <application>Python</application> development environment.
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| 42 | This is useful for object-oriented programming, writing scripts,
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| 43 | prototyping large programs or developing entire applications.
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| 44 | </para>
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| 45 |
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| 46 | <note><para><application>Python 3</application> was installed in LFS.
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| 47 | The only reason to rebuild it here is if optional modules
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| 48 | are needed.</para></note>
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| 49 |
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| 50 | &lfs91_checked;
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| 51 |
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| 52 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 53 | <itemizedlist spacing="compact">
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| 54 | <listitem>
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| 55 | <para>
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| 56 | Download (HTTP): <ulink url="&python3-download-http;"/>
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| 57 | </para>
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| 58 | </listitem>
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| 59 | <listitem>
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| 60 | <para>
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| 61 | Download (FTP): <ulink url="&python3-download-ftp;"/>
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| 62 | </para>
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| 63 | </listitem>
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| 64 | <listitem>
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| 65 | <para>
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| 66 | Download MD5 sum: &python3-md5sum;
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| 67 | </para>
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| 68 | </listitem>
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| 69 | <listitem>
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| 70 | <para>
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| 71 | Download size: &python3-size;
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| 72 | </para>
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| 73 | </listitem>
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| 74 | <listitem>
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| 75 | <para>
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| 76 | Estimated disk space required: &python3-buildsize;
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| 77 | </para>
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| 78 | </listitem>
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| 79 | <listitem>
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| 80 | <para>
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| 81 | Estimated build time: &python3-time;
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| 82 | </para>
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| 83 | </listitem>
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| 84 | </itemizedlist>
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| 85 |
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| 86 | <bridgehead renderas="sect3">Python 3 Dependencies</bridgehead>
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| 87 |
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| 88 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 89 | <para role="optional">
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| 90 | <xref linkend="bluez"/>,
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| 91 | <xref linkend="gdb"/> (required for some tests),
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| 92 | <xref linkend="valgrind"/>, and
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| 93 | <ulink url="http://www.bytereef.org/mpdecimal">libmpdec</ulink>
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| 94 | </para>
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| 95 |
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| 96 | <bridgehead renderas="sect4">Optional (For Additional Modules)</bridgehead>
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| 97 | <para role="optional">
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| 98 | <xref linkend="db"/>,
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| 99 | <xref linkend="sqlite"/>, and
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| 100 | <xref linkend="tk"/>
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| 101 | </para>
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| 102 |
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| 103 | <para condition="html" role="usernotes">User Notes:
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| 104 | <ulink url="&blfs-wiki;/Python3"/>
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| 105 | </para>
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| 106 | </sect2>
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| 107 |
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| 108 | <sect2 role="installation">
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| 109 | <title>Installation of Python 3</title>
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| 110 |
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| 111 | <para>
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| 112 | Install <application>Python 3</application> by running the following
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| 113 | commands:
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| 114 | </para>
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| 115 |
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| 116 | <screen><userinput>CXX="/usr/bin/g++" \
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| 117 | ./configure --prefix=/usr \
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| 118 | --enable-shared \
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| 119 | --with-system-expat \
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| 120 | --with-system-ffi \
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| 121 | --with-ensurepip=yes &&
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| 122 | make</userinput></screen>
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| 123 |
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| 124 | <para>
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| 125 | The test suite must be run separately, using an X terminal (see below).
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| 126 | </para>
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| 127 |
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| 128 | <para>
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| 129 | Now, as the <systemitem class="username">root</systemitem> user:
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| 130 | </para>
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| 131 |
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| 132 | <screen role="root"><userinput>make install &&
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| 133 | <!--ln -sfv pip&python3-majorver; /usr/bin/pip3 &&-->
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| 134 | chmod -v 755 /usr/lib/libpython&python3-majorver;.so &&
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| 135 | chmod -v 755 /usr/lib/libpython3.so</userinput></screen>
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| 136 |
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| 137 | <para>
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| 138 | The test suite must be run separately from the build, either before or
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| 139 | after the package is built and installed. Do not run
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| 140 | <command>make install</command> after running the test suite. To build
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| 141 | and install the package, you need to start with a fresh or clean source
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| 142 | tree. For the tests, you also need a clean source code, so either start by
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| 143 | removing the source code directory and starting over, by uncompressing
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| 144 | the source tarball or by running <command>make clean</command>. Then
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| 145 | configure again, adding <quote>--with-pydebug</quote> to the
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| 146 | <command>configure</command> switches above, run <command>make</command>,
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| 147 | then <command>make test</command>. Remember that tests must be executed
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| 148 | using an X terminal.
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| 149 | The test SBU highly depends on the speed of the internet connection.
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| 150 | The test_sqlite test is known to fail.
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| 151 | </para>
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| 152 |
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| 153 | </sect2>
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| 154 |
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| 155 | <sect2 role="commands">
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| 156 | <title>Command Explanations</title>
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| 157 |
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| 158 | <para>
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| 159 | <command> CXX="/usr/bin/g++" ./configure ...</command>: Avoid an annoying
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| 160 | message during configuration.
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| 161 | </para>
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| 162 |
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| 163 | <para>
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| 164 | <parameter>--with-system-expat</parameter>: This switch enables linking
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| 165 | against the system version of <application>Expat</application>.
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| 166 | </para>
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| 167 |
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| 168 | <para>
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| 169 | <parameter>--with-system-ffi</parameter>: This switch enables linking
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| 170 | against system version of <application>libffi</application>.
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| 171 | </para>
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| 172 |
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| 173 | <para>
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| 174 | <parameter>--with-ensurepip=yes</parameter> : This switch enables building
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| 175 | <command>pip</command> and <command>setuptools</command> packaging programs.
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| 176 | <command>setuptools</command> is needed for building some Python modules.
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| 177 | </para>
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| 178 |
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| 179 | <para>
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| 180 | <option>--with-dbmliborder=bdb:gdbm:ndbm</option>: Use this switch
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| 181 | if you want to build <application>Python</application> DBM Module
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| 182 | against <application>Berkeley DB</application> instead of
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| 183 | <application>GDBM</application>.
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| 184 | </para>
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| 185 |
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| 186 | <para>
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| 187 | <option>--enable-optimization</option>: Use this switch
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| 188 | if you want to enable <emphasis>expensive</emphasis> optimizations (i.e.
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| 189 | Profile Guided Optimizations). This adds around 20 SBU, but can
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| 190 | <emphasis>slightly</emphasis> speed up some uses, such as using
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| 191 | <application>Sphinx</application> for creating documentation, or use of
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| 192 | <application>Python3</application> scripts.
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| 193 | </para>
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| 194 |
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| 195 | <para>
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| 196 | <option>--with-lto</option>: This optional switch enables thick Link
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| 197 | Time Optimization. Unusually, it creates a much larger <filename
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| 198 | class="libraryfile">/usr/lib/python3.8/config-3.8-x86_64-linux-gnu/libpython3.8.a</filename>
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| 199 | with a small increase in the time to compile
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| 200 | <application>Python</application>. Run-time results do not appear to show
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| 201 | any benefit from doing this.
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| 202 | </para>
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| 203 | <!--
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| 204 | <para>
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| 205 | <command>ln -sfv ...</command>: When upgrading to Python-3.8, it was
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| 206 | discovered that the symlink to pip3 is sometimes not created. Create
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| 207 | the symlink so that pip3 can be used as described in the book.
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| 208 | </para>
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| 209 | -->
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| 210 | <para>
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| 211 | <command>chmod ...</command>: Fix permissions for shared libraries to be
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| 212 | consistent with other libraries.
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| 213 | </para>
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| 214 |
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| 215 | </sect2>
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| 216 |
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| 217 | <sect2 role="configuration">
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| 218 | <title>Configuring Python 3</title>
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| 219 |
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| 220 | <para>
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| 221 | In order for <command>python3</command> to find the installed
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| 222 | documentation, create the following version independent symlink:
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| 223 | </para>
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| 224 |
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| 225 | <screen role="root"><userinput>ln -svfn python-&python3-version; /usr/share/doc/python-3</userinput></screen>
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| 226 |
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| 227 | <para>
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| 228 | and add the following environment variable to the individual user's or
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| 229 | system's profile:
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| 230 | </para>
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| 231 |
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| 232 | <screen role="root"><userinput>export PYTHONDOCS=/usr/share/doc/python-3/html</userinput></screen>
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| 233 |
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| 234 | </sect2>
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| 235 |
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| 236 | <sect2 role="content">
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| 237 | <title>Contents</title>
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| 238 |
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| 239 | <segmentedlist>
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| 240 | <segtitle>Installed Programs</segtitle>
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| 241 | <segtitle>Installed Libraries</segtitle>
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| 242 | <segtitle>Installed Directories</segtitle>
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| 243 |
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| 244 | <seglistitem>
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| 245 | <seg>
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| 246 | 2to3 (symlink) and
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| 247 | 2to3-&python3-majorver;,
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| 248 |
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| 249 | easy_install (symlink) and
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| 250 | easy_install-&python3-majorver;,
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| 251 |
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| 252 | idle3 (symlink) and
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| 253 | idle&python3-majorver;,
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| 254 |
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| 255 | pip3 (symlink) and
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| 256 | pip&python3-majorver;,
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| 257 |
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| 258 | pydoc3 (symlink) and
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| 259 | pydoc&python3-majorver;,
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| 260 |
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| 261 | python3 (symlink);
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| 262 | python&python3-majorver;, and
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| 263 |
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| 264 | python3-config (symlink) and
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| 265 | python&python3-majorver;-config
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| 266 | <!--
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| 267 | pyvenv (symlink),
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| 268 | pyvenv-&python3-majorver;
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| 269 | -->
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| 270 | </seg>
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| 271 | <seg>
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| 272 | libpython&python3-majorver;.so and libpython3.so
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| 273 | </seg>
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| 274 | <seg>
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| 275 | /usr/include/python&python3-majorver;,
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| 276 | /usr/lib/python&python3-majorver;, and
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| 277 | /usr/share/doc/python-&python3-version;
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| 278 | </seg>
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| 279 | </seglistitem>
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| 280 | </segmentedlist>
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| 281 |
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| 282 | <variablelist>
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| 283 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 284 | <?dbfo list-presentation="list"?>
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| 285 | <?dbhtml list-presentation="table"?>
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| 286 | <!--
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| 287 | <varlistentry id="2to3">
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| 288 | <term><command>2to3</command></term>
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| 289 | <listitem>
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| 290 | <para>
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| 291 | is designed to assist in the transition between python2 and python3
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| 292 | by automatically converting code to be Python3 compatible.
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| 293 | </para>
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| 294 | <indexterm zone="python3 2to3">
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| 295 | <primary sortas="b-2to3">2to3</primary>
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| 296 | </indexterm>
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| 297 | </listitem>
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| 298 | </varlistentry>
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| 299 | Put here for easy use when removing Python2 -->
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| 300 | <varlistentry id="easy_install">
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| 301 | <term><command>easy_install</command></term>
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| 302 | <listitem>
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| 303 | <para>
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| 304 | is a frontend to pip3 to make it easier to configure python modules
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| 305 | through the PIP package manager.
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| 306 | </para>
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| 307 | <indexterm zone="python3 easy_install">
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| 308 | <primary sortas="python3 easy_install">easy_install</primary>
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| 309 | </indexterm>
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| 310 | </listitem>
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| 311 | </varlistentry>
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| 312 |
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| 313 | <varlistentry id="idle3">
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| 314 | <term><command>idle3</command></term>
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| 315 | <listitem>
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| 316 | <para>
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| 317 | is a wrapper script that opens a <application>Python</application>
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| 318 | aware GUI editor. For this script to run, you must have installed
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| 319 | <application>Tk</application> before Python so that the Tkinter
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| 320 | Python module is built.
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| 321 | </para>
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| 322 | <indexterm zone="python3 idle3">
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| 323 | <primary sortas="b-idle3">idle3</primary>
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| 324 | </indexterm>
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| 325 | </listitem>
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| 326 | </varlistentry>
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| 327 |
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| 328 | <varlistentry id="pydoc3">
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| 329 | <term><command>pydoc3</command></term>
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| 330 | <listitem>
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| 331 | <para>
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| 332 | is the <application>Python</application> documentation
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| 333 | tool.
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| 334 | </para>
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| 335 | <indexterm zone="python3 pydoc3">
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| 336 | <primary sortas="b-pydoc3">pydo3c</primary>
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| 337 | </indexterm>
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| 338 | </listitem>
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| 339 | </varlistentry>
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| 340 |
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| 341 | <varlistentry id="python3-prog">
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| 342 | <term><command>python3</command></term>
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| 343 | <listitem>
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| 344 | <para>
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| 345 | is an interpreted, interactive, object-oriented programming
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| 346 | language.
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| 347 | </para>
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| 348 | <indexterm zone="python3 python3-prog">
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| 349 | <primary sortas="b-python3">python3</primary>
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| 350 | </indexterm>
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| 351 | </listitem>
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| 352 | </varlistentry>
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| 353 |
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| 354 | <varlistentry id="python-ver">
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| 355 | <term><command>python&python3-majorver;</command></term>
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| 356 | <listitem>
|
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| 357 | <para>
|
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| 358 | is a version-specific name for the <command>python</command>
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| 359 | program.
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| 360 | </para>
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| 361 | <indexterm zone="python3 python-ver">
|
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| 362 | <primary
|
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| 363 | sortas="b-python&python3-majorver;">python&python3-majorver;</primary>
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| 364 | </indexterm>
|
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| 365 | </listitem>
|
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| 366 | </varlistentry>
|
|---|
| 367 | <!--
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| 368 | <varlistentry id="pyvenv">
|
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| 369 | <term><command>pyvenv</command></term>
|
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| 370 | <listitem>
|
|---|
| 371 | <para>
|
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| 372 | creates virtual <application>Python</application> environments in
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| 373 | one or more target directories.
|
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| 374 | </para>
|
|---|
| 375 | <indexterm zone="python3 pyvenv">
|
|---|
| 376 | <primary
|
|---|
| 377 | sortas="b-python&python3-majorver;">python&python3-majorver;</primary>
|
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| 378 | </indexterm>
|
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| 379 | </listitem>
|
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| 380 | </varlistentry>
|
|---|
| 381 | -->
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| 382 | </variablelist>
|
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| 383 |
|
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| 384 | </sect2>
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| 385 |
|
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| 386 | </sect1>
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