pyysin

Pyysin is a Python library described as providing tooling for a lightweight data interchange format designed to be easy to read and easy to parse in Python applications. The project positions itself as a compact alternative to JSON and YAML when small size and fast parsing are priorities, while maintaining familiar Pythonic data representations.

Core features include a streaming tokenizer, a parser, a serializer, and a small set of built-in data type handlers. The design emphasizes deterministic output, helpful syntax error messages, and a minimal dependency footprint. Pyysin aims to be portable across Python 3.7 and newer and to run in common environments such as servers and scripting contexts.

Architecturally, Pyysin separates the ingestion, interpretation, and emission stages. The core engine exposes a pluggable backend interface, allowing users to plug in custom scalars or dialects, and to adapt the format to specific domain needs. The implementation is intended to be memory-efficient and friendly to incremental parsing.

Usage typically involves installing the package from a Python package index and importing a small API surface, such as load and dump utilities. A typical workflow reads data from a string or file-like object and converts it to Python objects, and vice versa for serialization. The library provides basic error handling and type validation hooks to help catch invalid input.

Development and reception: Pyysin is documented with tutorials and an API reference in its official docs, and open contributions are welcomed through standard repository workflows. The project uses permissive licensing in line with common Python ecosystem practices. Availability is reported on major package indexes and distribution channels.

See also: JSON, YAML, data serialization formats, Python packaging.