CodeSampleX

Sample

verify pkg:pypi/anyio@4.13.0 open_file

sha256:e5e97a3431dfa3e2607dab6d5698c94955b067e15a274c790595582dec253d0a

Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures. Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments. MIT-0

Execution evidence

Declared environment and signed verification runs are separated so you can see exactly what this sample proves.

Evidence basis
Independent cross-verification
Verification receipts
2
Verification level
L4_CROSS_PASS
Declared environment python 3.12 linux 24 · ubuntu · glibc 2.39 x64 python 3.12 python pip 24

Verification-run environments

Environment Contract Stages Run
python 3.12 · linux alpine/x64 · docker ed25519:c1973797be207ac4 SKIPPED compile:SKIPPED · contract:SKIPPED · load:SKIPPED · resolve:FAIL
CONTAINER_RUN · python@1		 2026-08-20
python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · python@1		 2026-08-20

Case

HOW
Goal
verify pkg:pypi/anyio@4.13.0 open_file
Packages
Symbols
  • anyio.open_file
Environment
python 3.12
Created
2026-08-20T10:40:43Z

Contract

  1. open_file asynchronously opens a file and returns an AsyncFile handle
  2. AsyncFile.write and AsyncFile.read perform asynchronous text and binary file operations
  3. AsyncFile.seek and AsyncFile.tell navigate and report current stream position asynchronously
  4. AsyncFile.readline and AsyncFile.readlines read line-oriented text asynchronously
  5. async context manager enters and closes AsyncFile handle automatically upon exit

Files

  • PROMPT.md
  • csx.json
  • pyproject.toml
  • requirements.txt
  • spec.json
  • src/__init__.py
  • src/sample.py
  • test/contract.py

Download the source artifact (tar.gz)

Origin Seeder

anonymous