lfs-book/chapter06/python.xml

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  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-Python" role="wrap">
  <?dbhtml filename="Python.html"?>

  <sect1info condition="script">
    <productname>Python</productname>
    <productnumber>&python-version;</productnumber>
    <address>&python-url;</address>
  </sect1info>

  <title>Python-&python-version;</title>

  <indexterm zone="ch-system-Python">
    <primary sortas="a-python">python</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The Python 3 package contains the Python development environment. It
    is useful for object-oriented programming, writing scripts, prototyping
    large programs or developing entire applications.</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&python-ch6-sbu;</seg>
        <seg>&python-ch6-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Python 3</title>

    <para>Prepare Python for compilation:</para>

<screen><userinput remap="configure">./configure --prefix=/usr       \
            --enable-shared     \
            --with-system-expat \
            --with-system-ffi   \
            --with-ensurepip=yes</userinput></screen>

    <variablelist>
      <title>The meaning of the configure options:</title>

    <varlistentry>
      <term><parameter>--with-system-expat</parameter></term>
      <listitem>
        <para>This switch enables linking against system version of
        <application>Expat</application>.</para>
       </listitem>
     </varlistentry>

    <varlistentry>
      <term><parameter>--with-system-ffi</parameter></term>
      <listitem>
        <para>This switch enables linking against system version of
        <application>libffi</application>.</para>
      </listitem>
    </varlistentry>

    <varlistentry>
      <term><parameter>--with-ensurepip=yes</parameter></term>
      <listitem>
        <para>This switch enables building <command>pip</command> and
        <command>setuptools</command> packaging programs.</para>
      </listitem>
    </varlistentry>

    </variablelist>

    <para>Compile the package:</para>

<screen><userinput remap="make">make</userinput></screen>

    <para>To test the results, issue <command>make test</command>.
    Some tests requiring network connection or additional packages are
    skipped.  The test named test_normalization fails because network
    configuration is not completed yet.  For more comprehensive results,
    the test can be rerun when Python 3 is reinstalled in BLFS.</para>

    <para>Install the package:</para>

<screen><userinput remap="install">make install
chmod -v 755 /usr/lib/libpython&python-minor;.so
chmod -v 755 /usr/lib/libpython3.so
ln -sfv pip&python-minor; /usr/bin/pip3</userinput></screen>

    <variablelist>
      <title>The meaning of the install commands:</title>
<!-- ======  Change 8m if Python minor version changes ======= -->
    <varlistentry>
      <term><command>chmod -v 755 /usr/lib/libpython3.{8.,}so</command></term>
      <listitem>
        <para>Fix permissions for libraries to be consistent with other
        libraries.</para>
      </listitem>
    </varlistentry>

    </variablelist>

    <para>If desired, install the preformatted documentation:</para>

<screen><userinput remap="install">install -v -dm755 /usr/share/doc/python-&python-version;/html 

tar --strip-components=1  \
    --no-same-owner       \
    --no-same-permissions \
    -C /usr/share/doc/python-&python-version;/html \
    -xvf ../python-&python-version;-docs-html.tar.bz2</userinput></screen>

    <variablelist>
      <title>The meaning of the documentation install commands:</title>

    <varlistentry>
      <term><option>--no-same-owner</option> and <option>--no-same-permissions</option></term>
      <listitem>
        <para>Ensure the installed files have the correct ownership and 
        permissions.  Without these options, using <application>tar</application>
        will install the package files with the upstream creator's values. 
        </para>
      </listitem>
    </varlistentry>

    </variablelist>

  </sect2>

  <sect2 id="contents-python" role="content">
    <title>Contents of Python 3</title>

    <segmentedlist>
      <segtitle>Installed Programs</segtitle>
      <segtitle>Installed Library</segtitle>
      <segtitle>Installed Directories</segtitle>

      <seglistitem>
        <seg>
          2to3, idle3, pip3, pydoc3, python3, python3-config, and pyvenv
        </seg>
        <seg>
          libpython&python-minor;.so and libpython3.so
        </seg>
        <seg>
          /usr/include/python&python-minor;, 
          /usr/lib/python3, and
          /usr/share/doc/python-&python-version;
        </seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="python-2to3">
        <term><command>2to3</command></term>
        <listitem>
          <para>
            is a <application>Python</application> program that reads
            <application>Python 2.x</application> source code and applies a
            series of fixes to transform it into valid
            <application>Python 3.x</application> code.
          </para>
          <indexterm zone="ch-system-Python">
            <primary sortas="b-2to3">2to3</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="idle3">
        <term><command>idle3</command></term>
        <listitem>
          <para>
            is a wrapper script that opens a <application>Python</application>
            aware GUI editor. For this script to run, you must have installed
            <application>Tk</application> before Python so that the Tkinter
            Python module is built.
          </para>
          <indexterm zone="ch-system-Python">
            <primary sortas="b-idle3">idle3</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="pip3">
        <term><command>pip3</command></term>
        <listitem>
          <para>
            The package installer for Python. You can use pip to install
            packages from Python Package Index and other indexes.
          </para>
          <indexterm zone="ch-system-Python">
            <primary sortas="b-pip3">pip3</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="pydoc3">
        <term><command>pydoc3</command></term>
        <listitem>
          <para>
            is the <application>Python</application> documentation tool.
          </para>
          <indexterm zone="ch-system-Python">
            <primary sortas="b-pydoc3">pydoc3</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="python3">
        <term><command>python3</command></term>
        <listitem>
          <para>
            is an interpreted, interactive, object-oriented programming
            language.
          </para>
          <indexterm zone="ch-system-Python">
            <primary sortas="b-python3">python3</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="pyvenv">
        <term><command>pyvenv</command></term>
        <listitem>
          <para>
            creates virtual <application>Python</application> environments in
            one or more target directories.
          </para>
          <indexterm zone="ch-system-Python">
            <primary sortas="b-pyvenv">pyvenv</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>