How do you use pip, with an example?

pip install requests — Installs the requests library.

pip

Linux · Packages · reference only

Python package installer: it installs, upgrades and uninstalls libraries from the PyPI repository.

pip orden [opciones]

install paquete
Installs a package and its dependencies.
uninstall paquete
Uninstalls a package.
list
Lists the installed packages.
freeze
Lists installed packages with their exact version, in requirements.txt format.
show paquete
Shows the details of an installed package.
-r fichero
With install, installs the packages from a requirements file.
--upgrade
With install, upgrades the package if it is already installed.
--user
Installs only for your user, without touching the system.

pip install requests
Installs the requests library.
pip install -r requirements.txt
Installs all of a project's dependencies.
pip list
Shows the installed packages.
pip freeze > requirements.txt
Saves the exact versions so the environment can be reproduced.

On Debian 12 you must install it with sudo apt install python3-pip.
Debian 12 protects the system Python (PEP 668): outside a virtual environment, pip install gives the externally-managed-environment error; use python3 -m venv or pipx.