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stubtest raises an exception when a classmethod's first parameter not named cls #16583
Description
Crash Report
From python/typeshed#10544 (comment)
Where networkx's source code has:
class EdgeComponentAuxGraph:
@classmethod
def construct(EdgeComponentAuxGraph, G): ...
Traceback
Traceback (most recent call last):
File "C:\Program Files\Python39\lib\runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Program Files\Python39\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 1891, in <module>
sys.exit(main())
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 1887, in main
return test_stubs(parse_options(sys.argv[1:]))
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 1760, in test_stubs
for error in test_module(module):
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 223, in test_module
yield from verify(stub, runtime, [module_name])
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 401, in verify_mypyfile
yield from verify(stub_entry, runtime_entry, object_path + [entry])
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 543, in verify_typeinfo
yield from verify(stub_to_verify, runtime_attr, object_path + [entry])
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 1261, in verify_decorator
func = _resolve_funcitem_from_decorator(stub)
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 1240, in _resolve_funcitem_from_decorator
resulting_func = apply_decorator_to_funcitem(decorator, func)
File "C:\Users\Avasam\AppData\Local\Temp\tmpmhpy63_q\lib\site-packages\mypy\stubtest.py", line 1225, in apply_decorator_to_funcitem
raise StubtestFailure(
__main__.StubtestFailure: unexpected class argument name 'EdgeComponentAuxGraph' in networkx.algorithms.connectivity.edge_kcomponents.EdgeComponentAuxGraph.construct
To Reproduce
(Write what you did to reproduce the crash. Full source code is
appreciated. We also very much appreciate it if you try to narrow the
source down to a small stand-alone example.)
From my experience, in typeshed, changing any classmethod's first parameter of a class that is present at runtime should raise the exception.
For example, in stubs/urllib3/urllib3/fields.pyi, you could change RequestField.from_tuples's cls parameter to anything else (ie: not_cls). Then run python ./tests/stubtest_third_party.py urllib3.
Your Environment
- Mypy version used: mypy 1.7.1 (compiled: yes)
- Mypy command-line flags: (see typeshed)
- Mypy configuration options from
mypy.ini(and other config files): N/A - Python version used: 3.9.13
- Operating system and version: Windows 10 Version 10.0.19045 Build 19045
Activity
[-]stubtest crash with a classmethod's first parameter not named `cls`[/-][+]stubtest raises an exception when a `classmethod`'s first parameter not named `cls`[/+]jorenham commentedon Mar 5, 2025
I think this issue has been resolved in the meantime: In NumPy there are several classmethods that use
subtypeinstead ofcls, and stubtest seems to have no problem with them.Avasam commentedon Mar 6, 2025
Still failing: python/typeshed#13587 Could be due to the parameter being named exactly like the class.
https://github.com/python/typeshed/actions/runs/13690424147/job/38282574496?pr=13587#step:5:96