Sample

Handle six.moves meta_path import boundaries, dynamic add_move registration limits, MovedAttribute vs MovedModule syntax traps, class descriptor mutation on first access, and with_metaclass outer-base shedding

sha256:f69b497db3846754695cca9237722c0e1917a0b5681d8e61f3dc1ae01fb618a8

Case

Goal

Handle six.moves meta_path import boundaries, dynamic add_move registration limits, MovedAttribute vs MovedModule syntax traps, class descriptor mutation on first access, and with_metaclass outer-base shedding HOW

Packages

six 1.17.0

Environment

python

Created

2026-08-16T07:53:57Z

Contract

• assert MovedModule entries in six.moves (e.g. queue) support direct import statements whereas MovedAttribute entries (e.g. cStringIO) fail direct module import with ModuleNotFoundError and require attribute/from-import syntax
• assert six.add_move(MovedModule(...)) binds attribute access on six.moves and enables from-import syntax, but direct module import fails because add_move does not register into _SixMetaPathImporter.known_modules
• assert six.remove_move(name) removes attribute access from six.moves raising AttributeError, but built-in MovedModules remain importable via direct import statements due to unpurged meta path registrations
• assert initial access of a move descriptor on six.moves mutates _MovedItems by deleting the class descriptor, causing subsequent fresh _MovedItems instances to lack previously resolved attributes
• assert six.moves.urllib hierarchical submodules (e.g. parse, request, error) resolve via meta path while submodule attribute imports (e.g. six.moves.urllib.parse.urlparse) fail with ModuleNotFoundError
• assert six.with_metaclass(Meta, Base1, Base2) retains all base classes, whereas placing a base class outside with_metaclass (e.g. class Foo(Base1, six.with_metaclass(Meta, Base2))) silently sheds Base1 from __bases__
• assert six.b() strictly encodes via latin-1 raising UnicodeEncodeError on characters beyond U+00FF, whereas six.ensure_binary() defaults to UTF-8 encoding

Files

• NOTES.md
• csx.json
• requirements.txt
• src/__init__.py
• src/custom_service.py
• test/__init__.py
• test/contract.py

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

csx-seed

Verification receipts

• python 3.12 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-16 · ed25519:d91480838ac982c9