Install Flower
==============

Python version
--------------

Flower requires at least `Python 3.9 <https://docs.python.org/3.9/>`_, but `Python 3.10
<https://docs.python.org/3.10/>`_ or above is recommended.

Install stable release
----------------------

Using pip
~~~~~~~~~

Stable releases are available on `PyPI <https://pypi.org/project/flwr/>`_:

::

    python -m pip install flwr

For simulations that use the Virtual Client Engine, ``flwr`` should be installed with
the ``simulation`` extra:

::

    python -m pip install "flwr[simulation]"

Using conda (or mamba)
~~~~~~~~~~~~~~~~~~~~~~

Flower can also be installed from the ``conda-forge`` channel.

If you have not added ``conda-forge`` to your channels, you will first need to run the
following:

::

    conda config --add channels conda-forge
    conda config --set channel_priority strict

Once the ``conda-forge`` channel has been enabled, ``flwr`` can be installed with
``conda``:

::

    conda install flwr

or with ``mamba``:

::

    mamba install flwr

Verify installation
-------------------

The following command can be used to verify if Flower was successfully installed. If
everything worked, it should print the version of Flower to the command line:

.. code-block:: bash
    :substitutions:

    python -c "import flwr;print(flwr.__version__)"
    |stable_flwr_version|

Advanced installation options
-----------------------------

Install via Docker
~~~~~~~~~~~~~~~~~~

:doc:`Run Flower using Docker <docker/index>`

Install pre-release
~~~~~~~~~~~~~~~~~~~

New (possibly unstable) versions of Flower are sometimes available as pre-release
versions (alpha, beta, release candidate) before the stable release happens:

::

    python -m pip install -U --pre flwr

For simulations that use the Virtual Client Engine, ``flwr`` pre-releases should be
installed with the ``simulation`` extra:

::

    python -m pip install -U --pre 'flwr[simulation]'

Install nightly release
~~~~~~~~~~~~~~~~~~~~~~~

The latest (potentially unstable) changes in Flower are available as nightly releases:

::

    python -m pip install -U flwr-nightly

For simulations that use the Virtual Client Engine, ``flwr-nightly`` should be installed
with the ``simulation`` extra:

::

    python -m pip install -U flwr-nightly[simulation]