Max Line Length in style guide ignored with python 3.14 when checking multiple files
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调研方向
从 style_guide.check_files 使用的 legacy API 路径开始，在 Python 3.14 下重现检查单个文件与多个文件之间的差异。跟踪 max_line_length 在多文件检查期间的应用方式，然后验证在所报告的示例中，两个文件都遵循了配置的值。
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描述
how did you install flake8?
Installed on demand from TOML requirements as part of uv run command launch
unmodified output of flake8 --bug-report
{
"platform": {
"python_implementation": "CPython",
"python_version": "3.14.2",
"system": "Linux"
},
"plugins": [
{
"plugin": "mccabe",
"version": "0.7.0"
},
{
"plugin": "pep8-naming",
"version": "0.15.1"
},
{
"plugin": "pycodestyle",
"version": "2.14.0"
},
{
"plugin": "pyflakes",
"version": "3.4.0"
}
],
"version": "7.3.0"
}
describe the problem
what I expected to happen
when using flake8 programmatically it should be possible to check multiple files with the configured style guide. This works correctly with python3.12 but seems to be ignored when using python 3.14
set up style guide
Python 3.14.2 (main, Jan 9 2026, 09:06:43) [GCC 8.5.0 20210514 (Red Hat 8.5.0-28.0.1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
Ctrl click to launch VS Code Native REPL
>>> from flake8.api import legacy as flake8
>>> ignore_list = []
>>> line_length = 88
>>> style_guide = flake8.get_style_guide(extend_ignore=ignore_list, max_line_length=line_length, color="never")
>>> style_guide.options
Namespace(verbose=0, output_file=None, append_config=[], config=None, isolated=False, enable_extensions=None, require_plugins=None, filenames=[], quiet=0, color='never', count=False, exclude=['.svn', 'CVS', '.bzr', '.hg', '.git', '__pycache__', '.tox', '.nox', '.eggs', '*.egg'], extend_exclude=[], filename=['*.py'], stdin_display_name='stdin', format='default', hang_closing=False, ignore=None, extend_ignore=[], per_file_ignores='', max_line_length=88, max_doc_length=None, indent_size=4, select=None, extend_select=None, disable_noqa=False, show_source=False, statistics=False, exit_zero=False, jobs=JobsArgument('auto'), tee=False, benchmark=False, bug_report=False, max_complexity=-1, ignore_names=['setUp', 'tearDown', 'setUpClass', 'tearDownClass', 'setUpModule', 'tearDownModule', 'asyncSetUp', 'asyncTearDown', 'setUpTestData', 'failureException', 'longMessage', 'maxDiff'], classmethod_decorators=['classmethod'], staticmethod_decorators=['staticmethod'], builtins=None, doctests=False, extended_default_ignore=['N818'], extended_default_select=['C90', 'N8', 'F', 'E', 'W'])
Check files ignores the set max_line_length when running with multiple files
>>> style_guide.check_files(['file1.py', 'file2.py'])
file1.py:65:80: E501 line too long (88 > 79 characters)
file1.py:66:80: E501 line too long (85 > 79 characters)
file2.py:17:80: E501 line too long (81 > 79 characters)
file2.py:18:80: E501 line too long (87 > 79 characters)
file2.py:19:80: E501 line too long (88 > 79 characters)
<flake8.api.legacy.Report object at 0x7f070003b4d0>
However running the files individually works ok, and then it is possible to run the two files in the same check correctly
>>> style_guide.check_files(['file1.py'])
<flake8.api.legacy.Report object at 0x7f06ffc50690>
>>> style_guide.check_files(['file2.py'])
<flake8.api.legacy.Report object at 0x7f06ffc507d0>
>>>
>>>
>>> style_guide.check_files(['file1.py', 'file2.py'])
<flake8.api.legacy.Report object at 0x7f07001223f0>
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