%general-entities; ]> Python &python-version;

&python-url;

Python Prepare Python for compilation: ./configure --prefix=/usr \ --enable-shared \ --with-system-expat \ --with-system-ffi \ --enable-optimizations --with-system-expat This switch enables linking against system version of Expat. --with-system-ffi This switch enables linking against system version of libffi. --enable-optimizations This switch enables stable, but expensive, optimizations. Compile the package: make Running the tests at this point is not recommended. The tests are known to hang indefinitely in the partial LFS environment. If desired, the tests can be rerun at the end of this chapter or when Python 3 is reinstalled in BLFS. To run the tests anyway, issue make test. Install the package: make install In several places we use the pip3 command to install Python 3 programs and modules for all users as root. This conflicts with the Python developers recommendation to install packages into a virtual environment or the home directory of a regular user (by running pip3 as this user). To this end, a multi-line warning is written when using pip3 as the root user. The main reason of this recommendation is for avoiding a conflict with the system package manager (dpkg for example), but LFS does not have a system-wide package manager so this is not a problem. And, pip3 will attempt to check for a new version of itself whenever it's run. As domain name resolving is not configured yet in LFS chroot environment, it will fail to check for a new version and produce a warning. Once we boot the LFS system and set up network connection, it will then produce a warning telling the user to update it from a pre-built wheel on PyPI if any new version is available. But LFS consider pip3 a part of Python 3 so it should not be updated separately, and an update from a pre-built wheel will deviate from our purpose to build a Linux system from source code. So the warning for a new pip3 version should be ignored as well. If desired, suppress these warnings by running the following commands: cat > /etc/pip.conf << EOF [global] root-user-action = ignore disable-pip-version-check = true EOF In LFS and BLFS we normally build and install Python modules with the pip3 command. Please take care that the pip3 install commands in both the books should be run as the &root; user unless it's for a Python virtual environment. Running a pip3 install as a non-&root; user may seem to work fine, but it will cause the installed module to be inaccessible by other users. pip3 install will not reinstall an already installed module by default. For using the pip3 install command to upgrade a module (for example, from meson-0.61.3 to meson-0.62.0), insert the option --upgrade into the command line. If it's really necessary to downgrade a module or reinstall the same version for some reason, insert --force-reinstall --no-deps into the command line. If desired, install the preformatted documentation: 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 --no-same-owner and --no-same-permissions Ensure the installed files have the correct ownership and permissions. Without these options, using tar will install the package files with the upstream creator's values. Installed Programs Installed Library Installed Directories 2to3, idle3, pip3, pydoc3, python3, and python3-config libpython&python-minor;.so and libpython3.so /usr/include/python&python-minor;, /usr/lib/python3, and /usr/share/doc/python-&python-version; Short Descriptions 2to3 is a Python program that reads Python 2.x source code and applies a series of fixes to transform it into valid Python 3.x code 2to3 idle3 is a wrapper script that opens a Python aware GUI editor. For this script to run, you must have installed Tk before Python so that the Tkinter Python module is built idle3 pip3 The package installer for Python. You can use pip to install packages from Python Package Index and other indexes pip3 pydoc3 is the Python documentation tool pydoc3 python3 is an interpreted, interactive, object-oriented programming language python3