Setuptools

=======



Changes
-------
* 1704: Set sys.argv[0] in setup script run by build_meta.__legacy__
* 1959: Fix for Python 4: replace unsafe six.PY3 with six.PY2
* 1994: Fixed a bug in the "setuptools.finalize_distribution_options" hook that lead to ignoring the order attribute of entry points managed by this hook.

=======



Breaking Changes
----------------
* 1908: Drop support for Python 3.4.

=======



Breaking Changes
----------------
* 1634: Include ``pyproject.toml`` in source distribution by default. Projects relying on the previous behavior where ``pyproject.toml`` was excluded by default should stop relying on that behavior or add ``exclude pyproject.toml`` to their MANIFEST.in file.

Changes
-------
* 1927: Setuptools once again declares 'setuptools' in the ``build-system.requires`` and adds PEP 517 build support by declaring itself as the ``build-backend``. It additionally specifies ``build-system.backend-path`` to rely on itself for those builders that support it.

=======

Changes
-------

* 1921: Fix support for easy_install's ``find-links`` option in ``setup.cfg``.
* 1922: Build dependencies (setup_requires and tests_require) now install transitive dependencies indicated by extras.

=======



Changes
-------
* 1918: Fix regression in handling wheels compatibility tags.

=======



Breaking Changes
----------------
* 1830, 1909: Mark the easy_install script and setuptools command as deprecated, and use `pip <https://pip.pypa.io/en/stable/>`_ when available to fetch/build wheels for missing ``setup_requires``/``tests_require`` requirements, with the following differences in behavior:
* support for ``python_requires``
* better support for wheels (proper handling of priority with respect to PEP 425 tags)
* PEP 517/518 support
* eggs are not supported
* no support for the ``allow_hosts`` easy_install option (``index_url``/``find_links`` are still honored)
* pip environment variables are honored (and take precedence over easy_install options)
* 1898: Removed the "upload" and "register" commands in favor of :pypi:`twine`.

Changes
-------
* 1767: Add support for the ``license_files`` option in ``setup.cfg`` to automatically
include multiple license files in a source distribution.
* 1829: Update handling of wheels compatibility tags:
* add support for manylinux2010
* fix use of removed 'm' ABI flag in Python 3.8 on Windows
* 1861: Fix empty namespace package installation from wheel.
* 1877: Setuptools now exposes a new entry point hook "setuptools.finalize_distribution_options", enabling plugins like :pypi:`setuptools_scm` to configure options on the distribution at finalization time.