Sample
six 1.17.0: 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
Verified sample for pypi six 1.17.0: Handle six.moves meta_path import boundaries, dynamic add_move registration limits, MovedAttribute vs MovedModule syntax…
sha256:f69b497db3846754695cca9237722c0e1917a0b5681d8e61f3dc1ae01fb618a8
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python linux x64 python python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-16 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
HOW- 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
- Packages
- Symbols
-
- six.moves
- six.add_move
- six.remove_move
- six.MovedModule
- six.MovedAttribute
- six.with_metaclass
- six.b
- six.ensure_binary
- 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