Compatibility with Python-3.13

[sagitter]

Hi all.

Please, if reasonable for you, render python-future compatible with newer Python-3.13

uu and lib2to3 modules are no longer available and some tests fail:

==================================== ERRORS ====================================
_________ ERROR collecting tests/test_future/test_email_generation.py __________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_email_generation.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_email_generation.py:6: in <module>
    from future.backports.email.mime.multipart import MIMEMultipart
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/mime/multipart.py:12: in <module>
    from future.backports.email.mime.base import MIMEBase
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/mime/base.py:7: in <module>
    from future.backports.email import message
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/message.py:13: in <module>
    import uu
E   ModuleNotFoundError: No module named 'uu'
__________ ERROR collecting tests/test_future/test_email_multipart.py __________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_email_multipart.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_email_multipart.py:6: in <module>
    import future.backports.email.mime.multipart
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/mime/multipart.py:12: in <module>
    from future.backports.email.mime.base import MIMEBase
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/mime/base.py:7: in <module>
    from future.backports.email import message
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/message.py:13: in <module>
    import uu
E   ModuleNotFoundError: No module named 'uu'
_____________ ERROR collecting tests/test_future/test_futurize.py ______________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_futurize.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_futurize.py:9: in <module>
    from libfuturize.fixer_util import is_shebang_comment, is_encoding_comment
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/libfuturize/fixer_util.py:11: in <module>
    from lib2to3.fixer_util import (FromImport, Newline, is_import,
E   ModuleNotFoundError: No module named 'lib2to3'
__________ ERROR collecting tests/test_future/test_http_cookiejar.py ___________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_http_cookiejar.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_http_cookiejar.py:14: in <module>
    import future.backports.urllib.request as urllib_request
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/urllib/request.py:97: in <module>
    from future.backports.http import client as http_client
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/http/client.py:76: in <module>
    from future.backports.email import parser as email_parser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/parser.py:15: in <module>
    from future.backports.email.feedparser import FeedParser, BytesFeedParser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/feedparser.py:32: in <module>
    from future.backports.email import message
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/message.py:13: in <module>
    import uu
E   ModuleNotFoundError: No module named 'uu'
______________ ERROR collecting tests/test_future/test_httplib.py ______________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_httplib.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_httplib.py:14: in <module>
    from future.backports.http import client
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/http/client.py:76: in <module>
    from future.backports.email import parser as email_parser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/parser.py:15: in <module>
    from future.backports.email.feedparser import FeedParser, BytesFeedParser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/feedparser.py:32: in <module>
    from future.backports.email import message
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/message.py:13: in <module>
    import uu
E   ModuleNotFoundError: No module named 'uu'
________ ERROR collecting tests/test_future/test_libfuturize_fixers.py _________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_libfuturize_fixers.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_libfuturize_fixers.py:15: in <module>
    from lib2to3 import pygram, pytree, refactor, fixer_util
E   ModuleNotFoundError: No module named 'lib2to3'
______________ ERROR collecting tests/test_future/test_urllib.py _______________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_urllib.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_urllib.py:14: in <module>
    from future.backports.urllib import request as urllib_request
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/urllib/request.py:97: in <module>
    from future.backports.http import client as http_client
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/http/client.py:76: in <module>
    from future.backports.email import parser as email_parser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/parser.py:15: in <module>
    from future.backports.email.feedparser import FeedParser, BytesFeedParser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/feedparser.py:32: in <module>
    from future.backports.email import message
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/message.py:13: in <module>
    import uu
E   ModuleNotFoundError: No module named 'uu'
______________ ERROR collecting tests/test_future/test_urllib2.py ______________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_future/test_urllib2.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_future/test_urllib2.py:11: in <module>
    import future.backports.urllib.request as urllib_request
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/urllib/request.py:97: in <module>
    from future.backports.http import client as http_client
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/http/client.py:76: in <module>
    from future.backports.email import parser as email_parser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/parser.py:15: in <module>
    from future.backports.email.feedparser import FeedParser, BytesFeedParser
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/feedparser.py:32: in <module>
    from future.backports.email import message
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/future/backports/email/message.py:13: in <module>
    import uu
E   ModuleNotFoundError: No module named 'uu'
_____________ ERROR collecting tests/test_past/test_translation.py _____________
ImportError while importing test module '/builddir/build/BUILD/python-future-0.18.3/tests/test_past/test_translation.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
tests/test_past/test_translation.py:19: in <module>
    from past.translation import install_hooks, remove_hooks, common_substring
../../BUILDROOT/future-0.18.3-8.fc40.x86_64/usr/lib/python3.13/site-packages/past/translation/__init__.py:41: in <module>
    from lib2to3.pgen2.parse import ParseError
E   ModuleNotFoundError: No module named 'lib2to3'

=========================== short test summary info ============================
ERROR tests/test_future/test_email_generation.py
ERROR tests/test_future/test_email_multipart.py
ERROR tests/test_future/test_futurize.py
ERROR tests/test_future/test_http_cookiejar.py
ERROR tests/test_future/test_httplib.py
ERROR tests/test_future/test_libfuturize_fixers.py
ERROR tests/test_future/test_urllib.py
ERROR tests/test_future/test_urllib2.py
ERROR tests/test_past/test_translation.py
!!!!!!!!!!!!!!!!!!! Interrupted: 9 errors during collection !!!!!!!!!!!!!!!!!!!!