Python 3.14: assertion failure related to ast._const_node_type_names

[musicinmybrain]

Describe the bug

In rope/base/ast.py, it’s expected that ast._const_node_type_names exists. Otherwise, the library falls back to a backport intended for Python 3.7 and older, and this assumption is confirmed with an assertion:

rope/rope/base/ast.py

Lines 7 to 22 in 55169bb

	try:
	# Suppress the mypy complaint: Module "ast" has no attribute "_const_node_type_names"
	from ast import _const_node_type_names # type:ignore
	except ImportError:
	# backported from stdlib `ast`
	assert sys.version_info < (3, 8)
	_const_node_type_names = {
	bool: "NameConstant", # should be before int
	type(None): "NameConstant",
	int: "Num",
	float: "Num",
	complex: "Num",
	str: "Str",
	bytes: "Bytes",
	type(...): "Ellipsis",
	}

However, as of Python 3.14.0a5, Python 3.14 also lacks ast._const_node_type_names, so importing rope.base.ast results in an assertion failure.

To Reproduce
Steps to reproduce the behavior:

$ git checkout https://github.com/python-rope/rope.git
$ cd rope
$ uv venv --python 3.14
$ source .venv/bin/activate
(rope) $ uv pip install -e .[dev]
(rope) $ python -m pytest

4. Describe the error or unexpected result that you are getting

ImportError while loading conftest '/home/ben/src/forks/rope/ropetest/conftest.py'.
ropetest/conftest.py:10: in <module>
 from ropetest import testutils
ropetest/testutils.py:9: in <module>
 import rope.base.project
rope/base/project.py:13: in <module>
 from rope.base import exceptions, history, pycore, taskhandle, utils
rope/base/pycore.py:6: in <module>
 import rope.base.libutils
rope/base/libutils.py:7: in <module>
 from rope.base import pyobjectsdef, taskhandle, utils
rope/base/pyobjectsdef.py:1: in <module>
 import rope.base.builtins
rope/base/builtins.py:6: in <module>
 import rope.base.evaluate
rope/base/evaluate.py:5: in <module>
 import rope.base.pynames
rope/base/pynames.py:5: in <module>
 import rope.base.pyobjects
rope/base/pyobjects.py:3: in <module>
 from rope.base import ast, exceptions, utils
rope/base/ast.py:12: in <module>
 assert sys.version_info < (3, 8)
E AssertionError

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• Rope Python version: ...
• Rope version: ...
• Text editor/IDE and version: ...

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