Parameter loader turns __pycache__ directories into parameter nodes

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  • ¿Algo no está bien?
#638 0 comentarios 0 reacciones 0 asignados Ver en GitHub

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@anth-volk ya está trabajando en esto.

Desde el 29/10/2026.

  • #637 de @anth-volk — abierto

Evaluación

Dificultad
2/5
Tiempo estimado
1-3 horas
Aptitud para principiantes
35/100
Tipo de issue
Error
Claridad
Bien especificado
Estado de actividad
Estancado
Stack tecnológico
python
Área
backend

Línea de trabajo

Read policyengine_core/parameters/parameter_node.py, focusing on the subdirectory branch and the existing EXCLUDED_PARAMETER_CHILD_NAMES checks. Reproduce the issue with a parameter directory containing __pycache__ or a hidden subdirectory, then check the parameter tree excludes both. A linked pull request (#637) is already open.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

bug

Problem

ParameterNode(directory_path=...) makes every subdirectory of a parameter directory a child node. EXCLUDED_PARAMETER_CHILD_NAMES in policyengine_core/parameters/parameter_node.py already lists __pycache__, but only the YAML-file branch and the inline-data branch check it. The subdirectory branch does not, so a __pycache__ directory becomes an empty <directory>.__pycache__ node.

Python writes __pycache__ into a parameter directory whenever that directory is also a Python package that gets imported. The loaded parameter tree therefore depends on whether bytecode has been written to disk.

Effect

policyengine-us 2.2.1 has six parameter directories that hold only an __init__.py and CSV files, and US variable modules import them:

  • gov.hhs.medicaid.geography
  • gov.hud.fmr
  • gov.hud.income_limits
  • gov.hud.payment_standards
  • gov.states.fl.doe.sr.rates.reimbursement
  • gov.states.tx.twc.ccs.payment.rates_expanded_age_groups

Without bytecode caches, each of these nodes has no children. With caches, each has one empty __pycache__ child. policyengine.py skips parameter nodes with no children, so its US parameter-node count changes by 6 depending on whether the caches exist: 28,559 without them and 28,565 with them, measured with policyengine-us 2.2.1 and policyengine-core 3.33.3.

The Public API's v2 catalog takes its parameter nodes from policyengine.py. Its exact-count integration test (tests/integration/test_v2_catalog_installed.py) reports 29,361 parameter nodes on macOS with PYTHONDONTWRITEBYTECODE=1 and 29,367 elsewhere. The count follows the files on disk, not the environment variable: once caches have been written, for example by pip install's bytecode compilation or an earlier run, PYTHONDONTWRITEBYTECODE=1 still gives the higher count.

Hidden directories have the same problem. A .ipynb_checkpoints directory inside a parameter directory loads copies of the YAML files next to it as extra parameters, under names that are not valid dotted paths.

Expected

The loaded parameter tree should not depend on bytecode caches or on hidden tool directories. Subdirectories named __pycache__, and hidden subdirectories, should not become parameter nodes.

Lenguaje dominante
Python
Estrellas
22
Forks
30
Merge medio
4 d 20 h
PR fusionados (30 d)
26

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Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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