pydanny/cached-property

Review signals: 2 known vulnerability.

Reviewed as expected for a test run: attempted writes that failed, so nothing was written.

OSV reports a known vulnerability in this dependency version. pytest 2 findings.

OSV scanned supported lockfiles; unpinned dependencies and unsupported formats are outside this check.

A short run cannot establish that code is safe.

Connections show IP addresses; proxies can hide the final hostname.

Tracing covers dispatched commands and their children, not the whole OS; guest root can interfere with tracing.

Full safety evidence →

• Cached property values remain cached between accesses.: Probe could not complete: a unit suite does not establish a useful product operation

  Source: Now when we run it the price stays at $550.

  Input: cached_property test suite

  Expected: tests pass

  Command: <guest-path> -m pytest tests/test_cached_property.py

  Observed: Probe could not complete: a unit suite does not establish a useful product operation

Examples

• Run documented make test target: command output contains a crash diagnostic

  Source: Makefile / test

  Input: Project tests

  Expected: All tests pass

  Command: <guest-path> -m pytest

  Observed: urn self.run(*args, **kwds) tests/test_coroutine_cached_property.py::TestCachedProperty::test_reset_cached_property /usr/lib/python3.12/unittest/case.py:690: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method TestCachedProperty.test_reset_cached_property of <tests.test_coroutine_cached_property.TestCachedProperty testMethod=test_reset_cached_property>>) return self.run(*args, **kwds) -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html ======================== 27 passed, 6 warnings in 4.55s ========================

Demonstrate cached_property caching and run project test suite

pwd; rg --files -g 'README*' -g 'pyproject.toml' -g 'setup.py' -g 'setup.cfg' -g 'tox.ini' -g 'Makefile' -g '.github/workflows/**' -g 'tests/**' -g 'examples/**' -g 'cached_property/**' -g 'requirements*' -g 'AGENTS.md' | head -120; git status --short; python3 --version; id -u; sed -n '1,240p' README.md
find . -maxdepth 3 -type f | sort | head -120; sed -n '1,240p' setup.py; find . -maxdepth 3 -type f -path '*test*' -o -path './.github/workflows/*'
sed -n '1,240p' Makefile; cat requirements.txt; cat tox.ini; sed -n '1,200p' .github/workflows/python-package.yml; sed -n '1,200p' cached_property.py
mkdir -p .coldpass; python3 -m pip install -e .; python3 - <<'PY'
from cached_property import cached_property
class Monopoly:
    def __init__(self): self.boardwalk_price=500
    @cached_property
    def boardwalk(self):
        self.boardwalk_price += 50
        return self.boardwalk_price
monopoly=Monopoly()
print(monopoly.boardwalk)
print(monopoly.boardwalk)
PY
python3 -m venv <guest-path> && <guest-path> -m pip install -e . && <guest-path>
<guest-path> -m pip install -r requirements.txt && <guest-path> -m pip install pytest && PATH=<guest-path> make test
cat > .coldpass/probe.json <<'EOF'
{"kind":"cli","argv":["<guest-path>","-c","from cached_property import cached_property\nclass Monopoly:\n def __init__(self): self.boardwalk_price=500\n @cached_property\n def boardwalk(self):\n  self.boardwalk_price+=50\n  return self.boardwalk_price\nm=Monopoly()\nprint(m.boardwalk)\nprint(m.boardwalk)"],"cwd":"<guest-path>","expected_text":"550\n550"}
EOF
cat > .coldpass/claims.json <<'EOF'
[{"kind":"claim","claim":"A cached property computes once and subsequent access returns the cached value.","source":"Now when we run it the price stays at $550.","input":"Monopoly boardwalk property accessed twice","expected":"550 on both accesses","probe_kind":"cli","argv":["<guest-path>","-c","from cached_property import cached_property\nclass Monopoly:\n def __init__(self): self.boardwalk_price=500\n @cached_property\n def boardwalk(self):\n  self.boardwalk_price+=50\n  return self.boardwalk_price\nm=Monopoly()\nprint(m.boardwalk)\nprint(m.boardwalk)"],"expected_text":"550\n550","cwd":"<guest-path>"}]
EOF
cat > .coldpass/examples.json <<'EOF'
[{"kind":"example","claim":"README cached property usage example","source":"README.md / How to use it","input":"Monopoly boardwalk accessed twice","expected":"550 twice","argv":["<guest-path>","-c","from cached_property import cached_property\nclass Monopoly:\n def __init__(self): self.boardwalk_price=500\n @cached_property\n def boardwalk(self):\n  self.boardwalk_price+=50\n  return self.boardwalk_price\nm=Monopoly()\nprint(m.boardwalk)\nprint(m.boardwalk)"],"cwd":"<guest-path>","expected_text":"550\n550"}]
EOF
cat > .coldpass/cycles.json <<'EOF'
{"detected":false,"reason":"Inspected README.md and Python package entry points; cached_property is invoked on attribute access and has no scheduler, polling loop, webhook, or recurring cycle."}
EOF
cat > .coldpass/report.json <<'EOF'
{"outcome":"working","fault_owner":"test","operation":"Demonstrate cached_property caching and run project test suite","operation_scope":"Python 3.12.3 venv; README example and documented make test","steps":["python3 -m venv <guest-path>","<guest-path> -m pip install -e .","<guest-path> -m pip install -r requirements.txt","PATH=<guest-path> make test"],"deviations":["System pip install -e . failed with externally-managed-environment; installed successfully into .venv.","README does not specify a direct command; replay uses the README's cached Monopoly example as a Python stdin-style operation.","27 tests passed with 6 deprecation/thread warnings."],"stuck_step":null,"main_blocker":null,"plain_failure":null,"suggested_fix":null}
EOF
<env-var>=<guest-path> python3 -I <guest-path> --validate --replay
cat .coldpass/claims.json
cat > .coldpass/probe.json <<'EOF'
{"kind":"cli","argv":["<guest-path>","-m","pytest","tests/test_cached_property.py"],"cwd":"<guest-path>","expected_text":"passed"}
EOF
cat > .coldpass/claims.json <<'EOF'
[{"kind":"claim","claim":"Cached property values remain cached between accesses.","source":"Now when we run it the price stays at $550.","input":"cached_property test suite","expected":"tests pass","probe_kind":"cli","argv":["<guest-path>","-m","pytest","tests/test_cached_property.py"],"expected_text":"passed","cwd":"<guest-path>"}]
EOF
cat > .coldpass/examples.json <<'EOF'
[{"kind":"example","claim":"Run documented make test target","source":"Makefile / test","input":"Project tests","expected":"All tests pass","argv":["<guest-path>","-m","pytest"],"cwd":"<guest-path>","expected_text":"passed"}]
EOF
<env-var>=<guest-path> python3 -I <guest-path> --validate --replay