.. _compatibility:

Version compatibility
=====================

Pooch backwards incompatible changes
------------------------------------

We try to retain backwards compatibility whenever possible. Major breaking
changes to the Pooch API will be marked by a major release and deprecation
warnings will be issued in previous releases to give developers ample time to
adapt.

If there are any backwards incompatible changes, they will be listed below:

.. list-table::
    :widths: 20 10 70

    * - **Version introduced**
      - **Severity**
      - **Notes**
    * - v1.0.0
      - Low
      - We replaced use of ``warning`` with the ``logging`` module for all
        messages issued by Pooch. This allows messages to be logged with
        different priorities and the user filter out log messages or silence
        Pooch entirely. **Users who relied on Pooch issuing warnings will need
        to update to capturing logs instead.** The vast majority of users are
        unaffected.

.. _dependency-versions:

Supported dependency versions
-----------------------------

Pooch follows the recommendations in
`NEP29 <https://numpy.org/neps/nep-0029-deprecation_policy.html>`__ for setting
the minimum required version of our dependencies.
In short, we support **all minor releases of our dependencies from the previous
24 months** before a Pooch release with a minimum of 2 minor releases.

We follow this guidance conservatively and won't require newer versions if the
older ones are still working without causing problems.
Whenever support for a version is dropped, we will include a note in the
:ref:`changes`.

.. note::

    This was introduced in Pooch v1.6.0.


.. _python-versions:

Supported Python versions
-------------------------

If you require support for older Python versions, please pin Pooch to the
following releases to ensure compatibility:

.. list-table::
    :widths: 40 60

    * - **Python version**
      - **Last compatible Pooch release**
    * - 2.7
      - 0.6.0
    * - 3.5
      - 1.2.0
    * - 3.6
      - 1.6.0