cachehash 1.1.4

This tool memoizes data to sqlite.

cachehash

Cachehash is a lightweight Python library for caching file, directory, and value data in SQLite using fast xxhash checksums.

It is designed to memoize expensive computations by binding results to the content hash of files or directories, so you can skip recomputation when inputs have not changed.

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Features

• ⚡ Fast hashing with xxhash
• 📂 Hash individual files, whole directories (structure + metadata + file content), or arbitrary values
• 💾 Store and retrieve JSON-serializable Python values
• 🗄️ Backed by SQLite, easy to inspect and portable
• 🔑 Get/set by path + hash, or by hash alone
• 🧰 Simple API for integration into data pipelines or caching layers

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Installation

pip install cachehash

Requires Python 3.9 – 3.13.

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Quick Start

from pathlib import Path
from cachehash.main import Cache

cache = Cache()

# Hash a file
file_hash = cache.hash_file(Path("data.csv"))
print(file_hash)

# Store computation result tied to the file
cache.set("data.csv", {"rows": 1234, "checksum": file_hash})

# Later, retrieve result if file unchanged
result = cache.get("data.csv")
print(result)

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API Overview

Cache

• hash_file(path) → str : Hash file contents
• hash_directory(path) → str : Hash entire directory tree
• hash_value(value) → str : Hash an arbitrary string/bytes
• get(path) → Any | None : Retrieve value by file path + hash
• get_by_hash(path) → Any | None : Retrieve value by hash only
• set(path, value, append=False) : Store a value by file path + hash
• set_by_hash(key, hash, value, append=False) : Store a value for precomputed hash
• set_value(key, value) : Store a value by key only (not tied to content)
• get_value(key) : Get a value by key only

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Development

Clone the repo and install with dev dependencies:

git clone https://github.com/VerinFast/cachehash.git
cd cachehash
pip install -e .[dev]

Run tests:

pytest

Format code:

black src

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License

Free for non-commercial use. See LICENSE for details.

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Links

• Homepage
• Bug Tracker
• Source