---
id: dawg2-python
version: "0.9.0"
license: MIT
license_treatment: permissive
maintenance: active
---

# DAWG2-Python — Pure-python reader for DAWGs (DAFSAs) created by dawgdic C++ library or DAWG Python extension.

License: permissive · Maintenance: active · Downloads: 400.6K/mo

## What it is and what it does

DAWG2-Python is a pure-Python reader for DAWG (directed acyclic word graph) files, a space-efficient data structure for storing and querying large sets of strings with common prefixes. It provides read-only access to DAWGs built by the dawgdic C++ library or the DAWG Python extension, without requiring compiled dependencies. The package aims for API compatibility with the original DAWG module where feasible, making it a drop-in replacement for loading and querying pre-built DAWGs.

The main use case is accessing DAWG data structures in pure Python environments—particularly under PyPy, where it performs well—or when you want to avoid the compilation overhead of C extensions. It supports prefix-based lookups, key iteration, and membership testing. The package is read-only by design; DAWGs must be created externally using the DAWG or dawgdic libraries.

Use it for:

- Load and query large word lists or dictionaries built as DAWGs without C extension dependencies.
- Perform prefix-based searches on linguistic or dictionary data stored in DAWG format.
- Run DAWG lookups under PyPy for better performance than CPython without recompiling.
- Integrate DAWG-based data structures into pure-Python applications or libraries.
- Check membership and iterate over keys in pre-built DAWG files for NLP or spell-checking tasks.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Read-only access to DAWG (directed acyclic word graph) files created by the dawgdic C++ library or DAWG Python package, without requiring compiled extensions.

Yes. The package is actively maintained, has no known vulnerabilities, installs with minimal friction, and solves a specific problem well: reading DAWG files in pure Python. Install it if you have pre-built DAWG data and want to query it without compiled extensions or C dependencies. Not suitable if you need to create DAWGs or require the fastest possible CPython performance.

## Install

pip install dawg2-python
uv add dawg2-python
poetry add dawg2-python

## Installing DAWG2-Python

Before you install: Low friction: single pure-Python dependency (typing-extensions), wheel distribution, and active maintenance with recent commits. Supports Python 3.8 through 3.13 and PyPy.

License in practice: MIT license is permissive; you may use, modify, and distribute this package freely in commercial and private projects with minimal restrictions.

Quickstart:

pip install DAWG2-Python

from DAWG2-Python import DAWG

d = DAWG().load('words.dawg')
if 'word' in d:
    print(d['word'])

Requires a pre-built DAWG file created by the DAWG Python package or dawgdic C++ library; this package cannot create DAWGs.

Verify before relying:

- Whether performance under CPython (stated as ~50x slower than PyPy) is acceptable for your use case.
- Compatibility with DAWG files created by specific versions of the dawgdic or DAWG libraries.
- Exact API compatibility scope with the original DAWG module beyond what the description states.

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 400.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

dawg reader pure python, directed acyclic word graph, trie-like data structure lookup, prefix search dictionary, linguistic data structure, word graph file reader, no-compile dawg access, data-structures, nlp-tools, pure-python

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