DiskStore Sqlite based disk store

DiskStore is an Apache2/MIT 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.

Features

• Pure-Python
• nearly 100% test coverage
• Performance matters
• Thread-safe and process-safe
• Developed on Python 3.10
• Tested on CPython 3.10, 3.11, 3.12, 3.13, 3.14, 3.15
• Tested using GitHub Actions

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"])

Everything is mostly stable and test coverage is nearly 100%. Documentation is missing.

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. Every overhead is eliminitated and it uses the faster sqlite library apsw with up to date sqlite library version.

License

Copyright 2025-2026 Wolfgang Langner

Licensed under the Apache License, Version 2.0 (the "License") or MIT; you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0
https://mit-license.org/

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.