Instalacja modułów Pythona
**************************

As a popular open source development project, Python has an active
supporting community of contributors and users that also make their
software available for other Python developers to use under open-
source license terms.

Dzięki temu użytkownicy Pythona mogą efektywnie korzystać się i
współpracować korzystając z rozwiązań stworzonych wcześniej w
odpowiedzi na popularne problemy (a czasami bardzo rzadkie!), oraz
udostępniać własne rozwiązania całej społeczności.

Ta część przewodnika dotyczy procesu instalacji. Przewodnik po
tworzeniu i udostępnianiu własnych projektów Python znajduje się w
Python packaging user guide.

Informacja:

  Użytkownicy związani z korporacjami i innymi instytucjami powinni
  zwrócić uwagę, że wiele organizacji ma własne zasady dotyczące
  korzystania z oprogramowania i udziału w projektach open source.
  Należy brać takie zasady pod uwagę korzystając z narzędzi
  instalacyjnych i dystrybucyjnych Pythona.


Główne pojęcia
==============

* **pip** is the preferred installer program. It is included by
  default with the Python binary installers.

* *Środowisko wirtualne* jest częściowo wyizolowanym środowiskiem
  Pythona instalowanym na potrzeby poszczególnych aplikacji a nie
  całego sytemu.

* "venv" is the standard tool for creating virtual environments. It
  defaults to installing **pip** into all created virtual
  environments.

* "virtualenv" is a third-party alternative (and predecessor) to
  "venv".

* The Python Package Index (PyPI) is a public repository of open
  source licensed packages made available for use by other Python
  users.

* The Python Packaging Authority is the group of developers and
  documentation authors responsible for the maintenance and evolution
  of the standard packaging tools and the associated metadata and file
  format standards. They maintain a variety of tools, documentation,
  and issue trackers on GitHub.

Zmienione w wersji 3.5: Korzystanie z "venv" jest obecnie zalecane do
tworzenia środowisk wirtualnych.

Zobacz także:

  Python Packaging User Guide: Creating and using virtual environments


Basic usage
===========

The standard packaging tools are all designed to be used from the
command line.

The following command will install the latest version of a module and
its dependencies from PyPI:

   python -m pip install JakisPakiet

Informacja:

  For POSIX users (including macOS and Linux users), the examples in
  this guide assume the use of a *virtual environment*.For Windows
  users, the examples in this guide assume that the option to adjust
  the system PATH environment variable was selected when installing
  Python.

It's also possible to specify an exact or minimum version directly on
the command line. When using comparator operators such as ">", "<" or
some other special character which get interpreted by shell, the
package name and the version should be enclosed within double quotes:

   python -m pip install JakisPakiet==1.0.4    # specyficzna wersja
   python -m pip install "JakisPakiet>=1.0.4"  # wersja minimum

Normally, if a suitable module is already installed, attempting to
install it again will have no effect. Upgrading existing modules must
be requested explicitly:

   Python -m pip install --upgrade JakisPakiet

More information and resources regarding **pip** and its capabilities
can be found in the Python Packaging User Guide.

Creation of virtual environments is done through the "venv" module.
Installing packages into an active virtual environment uses the
commands shown above.

Zobacz także:

  Python Packaging User Guide: Installing Python Distribution Packages


Jak ...?
========

Są to szybkie odpowiedzi lub linki do niektórych typowych zadań.


... zainstalować pakiety tylko dla bieżącego użytkownika?
---------------------------------------------------------

Passing the "--user" option to "python -m pip install" will install a
package just for the current user, rather than for all users of the
system.


... install scientific Python packages?
---------------------------------------

A number of scientific Python packages have complex binary
dependencies, and aren't currently easy to install using **pip**
directly. It will often be easier for users to install these packages
by other means rather than attempting to install them with **pip**.

Zobacz także:

  Python Packaging User Guide: Installing Scientific Packages


... work with multiple versions of Python installed in parallel?
----------------------------------------------------------------

On Linux, macOS, and other POSIX systems, use the versioned Python
commands in combination with the "-m" switch to run the appropriate
copy of **pip**:

   python3    -m pip install SomePackage  # default Python 3
   python3.14 -m pip install SomePackage  # specifically Python 3.14

Appropriately versioned **pip** commands may also be available.

On Windows, use the **py** Python launcher in combination with the
"-m" switch:

   py -3    -m pip install SomePackage  # default Python 3
   py -3.14 -m pip install SomePackage  # specifically Python 3.14


Common installation issues
==========================


Installing into the system Python on Linux
------------------------------------------

On Linux systems, a Python installation will typically be included as
part of the distribution. Installing into this Python installation
requires root access to the system, and may interfere with the
operation of the system package manager and other components of the
system if a component is unexpectedly upgraded using **pip**.

On such systems, it is often better to use a virtual environment or a
per-user installation when installing packages with **pip**.


Pip not installed
-----------------

It is possible that **pip** does not get installed by default. One
potential fix is:

   python -m ensurepip --default-pip

There are also additional resources for installing pip.


Installing binary extensions
----------------------------

Python once relied heavily on source-based distribution, with end
users being expected to compile extension modules from source as part
of the installation process.

With the introduction of the binary wheel format, and the ability to
publish wheels through PyPI, this problem is diminishing, as users are
more regularly able to install pre-built extensions rather than
needing to build them themselves.

Some of the solutions for installing scientific software that are not
yet available as pre-built wheel files may also help with obtaining
other binary extensions without needing to build them locally.

Zobacz także: Python Packaging User Guide: Binary Extensions
