setuptools deprecation warnings

[mgorny]

Describe the bug

As of 1.37.23, setuptools outputs a bunch of deprecation warnings.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

No warnings.

Current Behavior

/usr/lib/python3.10/site-packages/setuptools/dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated.
!!

        ********************************************************************************
        Please consider removing the following classifiers in favor of a SPDX license expression:

        License :: OSI Approved :: Apache Software License

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
  self._finalize_license_expression()

Then a ton of warnings resembling:

/usr/lib/python3.10/site-packages/setuptools/command/build_py.py:212: _Warning: Package 'botocore.data' is absent from the `packages` configuration.
!!

        ********************************************************************************
        ############################
        # Package would be ignored #
        ############################
        Python recognizes 'botocore.data' as an importable package[^1],
        but it is absent from setuptools' `packages` configuration.

        This leads to an ambiguous overall configuration. If you want to distribute this
        package, please make sure that 'botocore.data' is explicitly added
        to the `packages` configuration field.

        Alternatively, you can also rely on setuptools' discovery methods
        (for example by using `find_namespace_packages(...)`/`find_namespace:`
        instead of `find_packages(...)`/`find:`).

        You can read more about "package discovery" on setuptools documentation page:

        - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html

        If you don't want 'botocore.data' to be distributed and are
        already explicitly excluding 'botocore.data' via
        `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
        you can try to use `exclude_package_data`, or `include-package-data=False` in
        combination with a more fine grained `package-data` configuration.

        You can read more about "package data files" on setuptools documentation page:

        - https://setuptools.pypa.io/en/latest/userguide/datafiles.html


        [^1]: For Python, any directory (with suitable naming) can be imported,
              even if it does not contain any `.py` files.
              On the other hand, currently there is no concept of package data
              directory, all directories are treated like packages.
        ********************************************************************************

!!
  check.warn(importable)
/usr/lib/python3.10/site-packages/setuptools/command/build_py.py:212: _Warning: Package 'botocore.data.accessanalyzer' is absent from the `packages` configuration.
!!

        ********************************************************************************
        ############################
        # Package would be ignored #
        ############################
        Python recognizes 'botocore.data.accessanalyzer' as an importable package[^1],
        but it is absent from setuptools' `packages` configuration.

        This leads to an ambiguous overall configuration. If you want to distribute this
        package, please make sure that 'botocore.data.accessanalyzer' is explicitly added
        to the `packages` configuration field.

        Alternatively, you can also rely on setuptools' discovery methods
        (for example by using `find_namespace_packages(...)`/`find_namespace:`
        instead of `find_packages(...)`/`find:`).

        You can read more about "package discovery" on setuptools documentation page:

        - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html

        If you don't want 'botocore.data.accessanalyzer' to be distributed and are
        already explicitly excluding 'botocore.data.accessanalyzer' via
        `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
        you can try to use `exclude_package_data`, or `include-package-data=False` in
        combination with a more fine grained `package-data` configuration.

        You can read more about "package data files" on setuptools documentation page:

        - https://setuptools.pypa.io/en/latest/userguide/datafiles.html


        [^1]: For Python, any directory (with suitable naming) can be imported,
              even if it does not contain any `.py` files.
              On the other hand, currently there is no concept of package data
              directory, all directories are treated like packages.
        ********************************************************************************

!!
  check.warn(importable)

and so on.

Note that these are very old now, so there's a real risk that setuptools will actually break this soon.

Reproduction Steps

python -m build -w

Possible Solution

No response

Additional Information/Context

Similar issues occur in boto3 and awscli as well, but I've decided to limit to one report for now. Please let me know if you want me to submit the problem there as well.

SDK version used

1.37.23

Environment details (OS name and version, etc.)

Gentoo Linux amd64

[adev-code]

Hi @mgorny, thanks for reaching out. The warnings are expected as there are Python warnings that we don't have control of that we need to present to users. Please let me know if you have any other questions. Thank you.

[mgorny]

But these warnings are not indirect but directly due to the code in your setup.py, and they indicate that this setup.py will stop working in the future. I don't see specific dates in these warnings, but upstream has been both aggressively removing deprecated features lately and making intrusive changes that accidentally broke deprecated features, which makes it somewhat important to address them timely.