objectif

Stocker des objets Python sérialisés sur disque (usage local et sûr).

code minimal

import shelve, tempfile, os, pathlib
with tempfile.TemporaryDirectory() as tmp:
    path = os.path.join(tmp, "db")
    with shelve.open(path) as db:
        db["x"] = {"n": 1}
    with shelve.open(path) as db:
        print(db["x"]["n"] == 1)  # attendu: True

utilisation

import shelve, tempfile, os
with tempfile.TemporaryDirectory() as tmp:
    p = os.path.join(tmp, "kv")
    with shelve.open(p, writeback=False) as db:
        db["a"] = [1]; print("a" in db)

variante(s) utile(s)

import shelve
print(hasattr(shelve, "open"))

notes

• shelve repose sur dbm; ne chargez pas des données non fiables.
• writeback=False recommandé pour limiter la mémoire.