python-autopep8 fails to build with Python 3.13.0a1.

_________ ConfigurationFileTests.test_setupcfg_with_pycodestyle_config _________

self = <test.test_autopep8.ConfigurationFileTests testMethod=test_setupcfg_with_pycodestyle_config>

    def test_setupcfg_with_pycodestyle_config(self):
        line = "a =  1\n"
        fixed = "a = 1\n"
        setupcfg_flake8 = """[pycodestyle]\ndiff=True\nignore="E,W"\n"""
        with temporary_project_directory() as dirname:
            with open(os.path.join(dirname, "setup.cfg"), "w") as fp:
                fp.write(setupcfg_flake8)
            target_filename = os.path.join(dirname, "foo.py")
            with open(target_filename, "w") as fp:
                fp.write(line)
            p = Popen(list(AUTOPEP8_CMD_TUPLE) +
                      [target_filename, "-v"], stdout=PIPE)
            output = p.communicate()[0].decode("utf-8")
>           self.assertTrue(fixed in output)
E           AssertionError: False is not true

test/test_autopep8.py:6050: AssertionError
----------------------------- Captured stderr call -----------------------------
[file:/tmp/autopep8testpu5hd_b_/foo.py]
Traceback (most recent call last):
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 4578, in <module>
    sys.exit(main())
             ^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 4536, in main
    results = fix_multiple_files(args.files, args, sys.stdout)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 4431, in fix_multiple_files
    ret = _fix_file((name, options, output))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 4401, in _fix_file
    return fix_file(*parameters)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 3585, in fix_file
    original_source = readlines_from_file(filename)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 195, in readlines_from_file
    with open_with_encoding(filename) as input_file:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 172, in open_with_encoding
    encoding = detect_encoding(filename, limit_byte_check=limit_byte_check)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/autopep8-2.0.4/autopep8.py", line 182, in detect_encoding
    from lib2to3.pgen2 import tokenize as lib2to3_tokenize
ModuleNotFoundError: No module named 'lib2to3'
=========================== short test summary info ============================
FAILED test/test_autopep8.py::UnitTests::test_detect_encoding - ModuleNotFoun...
FAILED test/test_autopep8.py::UnitTests::test_detect_encoding_with_cookie - M...
FAILED test/test_autopep8.py::UnitTests::test_fix_2to3 - ModuleNotFoundError:...
FAILED test/test_autopep8.py::UnitTests::test_fix_2to3_subset - ModuleNotFoun...
FAILED test/test_autopep8.py::UnitTests::test_fix_file - ModuleNotFoundError:...
FAILED test/test_autopep8.py::UnitTests::test_fix_file_with_diff - ModuleNotF...
FAILED test/test_autopep8.py::UnitTests::test_format_block_comments - ModuleN...
FAILED test/test_autopep8.py::UnitTests::test_format_block_comments_should_leave_outline_alone
FAILED test/test_autopep8.py::UnitTests::test_format_block_comments_should_not_corrupt_special_comments
FAILED test/test_autopep8.py::UnitTests::test_format_block_comments_should_only_touch_real_comments
FAILED test/test_autopep8.py::UnitTests::test_format_block_comments_with_multiple_lines
FAILED test/test_autopep8.py::UnitTests::test_is_python_file - ModuleNotFound...
FAILED test/test_autopep8.py::UnitTests::test_match_file - ModuleNotFoundErro...
FAILED test/test_autopep8.py::UnitTests::test_readlines_from_file_with_bad_encoding
FAILED test/test_autopep8.py::UnitTests::test_readlines_from_file_with_bad_encoding2
FAILED test/test_autopep8.py::ConfigurationFileTests::test_pyproject_toml_with_flake8_config
FAILED test/test_autopep8.py::ConfigurationFileTests::test_pyproject_toml_with_iterable_value
FAILED test/test_autopep8.py::ConfigurationFileTests::test_pyproject_toml_with_verbose_option
FAILED test/test_autopep8.py::ConfigurationFileTests::test_setupcfg_with_flake8_config
FAILED test/test_autopep8.py::ConfigurationFileTests::test_setupcfg_with_pycodestyle_config
================ 20 failed, 74 passed, 462 deselected in 3.97s =================

https://docs.python.org/3.13/whatsnew/3.13.html:

- lib2to3 will be removed from Python 3.13

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.13/fedora-rawhide-x86_64/06557923-python-autopep8/

For all our attempts to build python-autopep8 with Python 3.13, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/package/python-autopep8/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.13:
https://copr.fedorainfracloud.org/coprs/g/python/python3.13/

Let us know here if you have any questions.

Python 3.13 is planned to be included in Fedora 41.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.13.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.