====== pip ======

===== parallel install =====

<code bash>
xargs --max-args=1 --max-procs=4 sudo pip install < requires.txt
</code>

===== error: externally-managed-environment =====

<code>
$ pip3 install yamllint
error: externally-managed-environment
× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
    python3-xyz, where xyz is the package you are trying to
    install.

    If you wish to install a non-Debian-packaged Python package,
    create a virtual environment using python3 -m venv path/to/venv.
    Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
    sure you have python3-full installed.

    If you wish to install a non-Debian packaged Python application,
    it may be easiest to use pipx install xyz, which will manage a
    virtual environment for you. Make sure you have pipx installed.

    See /usr/share/doc/python3.11/README.venv for more information.
note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.
hint: See PEP 668 for the detailed specification.

</code>

**Reason**: [[https://stackoverflow.com/questions/75602063/pip-install-r-requirements-txt-is-failing-this-environment-is-externally-manag|pip install -r requirements.txt is failing: This environment is externally managed]]

**Solution**:

   * [[https://peps.python.org/pep-0668/#guide-users-towards-virtual-environments|guide-users-towards-virtual-environments]]
  * for applications/executables use ''pipx'':
      * ''sudo apt install python3-full pipx''
      * ''pipx install yamllint''
  * for others ise ''venv''

Dirty solution (but usefull for Dockers or CI):

  * ''sudo rm /usr/lib/python3.11/EXTERNALLY-MANAGED''