DiskStore Sqlite based disk store

DiskStore is a BSD-3-Clause licensed disk storage library, written in pure Python.

Inspired by DiskCache library it implements a MutableMapping compatible sqlite based disk storage. Easy interface and very fast. Keys can be of basic sqlite storage classes defined by Python types int, float, str, bytes. Values can be of basic sqlite type or with custom configuration, supproting dataclasses, structtype, pydantic, ...

Features

• Pure-Python
• nearly 100% test coverage
• Performance matters
• Thread-safe and process-safe
• Developed on Python 3.15
• Tested on CPython 3.10, 3.11, 3.12, 3.13, 3.14, 3.15
• Optional performance improved implementation bases on apsw.

Quickstart

Installing DiskStore:

$ uv pip install diskstore

or

$ uv add diskstore

There are three basic storage classes available. DiskStore, DiskRead and DiskCache.

User Guide

Work in progress, look at unit tests for examples.

Example:

from diskstore import DiskStore

ds = DiskStore("/tmp/diskstore.db")
ds["key"] = "my value"
print(ds["key"])

See the docs/ directory for the user guide and API reference.

Timings

These are rough measurements. Compared to Diskcache library.

Diskstore library:

set: 28.8 µs get: 3.23 µs set/delete: 84 µs

Diskcache library:

set: 196 µs get: 15.5 µs set/delete: 535 µs

Why is the Diskstore library faster than others. Overhead is eliminated and operations where optimized. If APSW is installed (pip install diskstore[apsw]) it is used automatically for furhter performance improvements.

License

DiskStore is distributed under the terms of the BSD-3-Clause license.

Copyright 2025-2026 Wolfgang Langner