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From: "Tobias Oberstein" <tobias.oberstein@gmail.com>
Newsgroups: comp.lang.python.announce
Subject: [Python-announce] zlmdb v25.10.1 released
Date: Fri, 07 Nov 2025 10:43:04 -0000
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Hi all,

I'd like to share a new release of zlmdb: LMDB for Python with PyPy Support, Binary Wheels, and Vendored Dependencies.

- **📦 PyPI:** https://pypi.org/project/zlmdb/25.10.1/
- **📖 Docs:** https://zlmdb.readthedocs.io/en/latest/
- **💻 GitHub:** https://github.com/crossbario/zlmdb
- **📋 Full Announcement:** https://github.com/crossbario/zlmdb/discussions/73

## What is zlmdb?

zlmdb provides two APIs in one package:

1. **Low-level py-lmdb compatible API** - Drop-in replacement for py-lmdb with the same interface
2. **High-level ORM API** - Type-safe persistent objects with automatic serialization

## Why this release is interesting

**🔋 Batteries Included - Zero Dependencies**
- Vendored LMDB (no system installation needed)
- Vendored Flatbuffers (high-performance serialization built-in)
- Just `pip install zlmdb` and you're ready to go!

**🐍 PyPy Support**
- Built with CFFI (not CPyExt) so it works perfectly with PyPy
- Near-C performance with JIT compilation
- py-lmdb doesn't work on PyPy due to CPyExt dependency

**📦 Binary Wheels for Everything**
- CPython 3.11, 3.12, 3.13, 3.14 (including free-threaded 3.14t)
- PyPy 3.11
- Linux (x86_64, aarch64), macOS (Intel, Apple Silicon), Windows (x64)
- No compilation required on any platform

**⚡ Performance Features**
- Memory-mapped I/O (LMDB's legendary speed)
- Zero-copy operations where possible
- Multiple serializers: JSON, CBOR, Pickle, Flatbuffers
- Integration with Numpy, Pandas, and Apache Arrow

## Quick Example

```python
# Low-level API (py-lmdb compatible)
from zlmdb import lmdb

env = lmdb.open('/tmp/mydb')
with env.begin(write=True) as txn:
    txn.put(b'key', b'value')

# High-level ORM API
from zlmdb import zlmdb

class User(zlmdb.Schema):
    oid: int
    name: str
    email: str

db = zlmdb.Database('/tmp/userdb')
with db.begin(write=True) as txn:
    user = User(oid=1, name='Alice', email='alice@example.com')
    txn.store(user)
```

## When to use zlmdb?

- ✅ Need PyPy support (py-lmdb won't work)
- ✅ Want zero external dependencies
- ✅ Building for multiple platforms (we provide all wheels)
- ✅ Want both low-level control AND high-level ORM
- ✅ Need high-performance embedded database

zlmdb is part of the [WAMP project family](https://wamp-proto.org/) and used in production by [Crossbar.io](https://crossbar.io/).