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 !!!!!!!!!!!!!!!!!!!!

[nsoranzo]

I've opened #644 to get rid of uu.
For lib2to3, we may consider adding to the backports or replace with https://github.com/amyreese/fissix .

[MaxXor]

Hello, is this library still under active development? Unfortunately I'm considering to remove it from my project due to lack of python 3.13 support and search for a replacement.

[edschofield]

Hi @MaxXor , No, the library is no longer in active development. Please see the note here about the project's status.

Python 3.13 removes the 2to3 machinery which future depends on heavily. So future could only support Python 3.13 if someone is doing the work of maintaining 2to3 outside the regular Python project tree.

The need for the future project is getting further and further in the past. I'm curious about your use-case: why do you want in 2024-2025 to provide compatibility with both Python 2.x and Python 3.13?

[MaxXor]

I see, thanks for the insights @edschofield. I've been using this library in a smart meter project for a long time. Unfortunately I have to support some legacy systems as well. 😢 I think I'll stick with python 3.12 for the time being until I can drop python 2.7 support altogether in the near future.