openbim-ifc-py

Python bindings for openbim-ifc: read, edit and write IFC STEP files from Python.

Status	Partial
Latest release	0.2.0 (2026-09-29)
Registries	PyPI openbim-ifc
API documentation	rustdoc
Source	crates/openbim-ifc-py/

Overview

Python bindings for the IFC facade (ADR 0013, #39).

The compiled module is openbim_ifc._native; the public API is the pure Python package openbim_ifc, which wraps it and defines the value classes. Values cross as plain dicts in the tagged encoding shared with the WASM and C bindings; openbim_ifc turns them into frozen dataclasses.

This crate adds calling-convention glue only. IFC behaviour belongs in openbim-ifc, shared binding behaviour in openbim-ifc-binding-core.

Features

Feature	Default	Enables
rusty_alloc		dep:rusty_alloc-api, dep:rusty_alloc

Depends on

• openbim-ifc-binding-core

Changes

Latest release, 0.2.0 (2026-09-29):

Changed

• Links every bundled IFC release explicitly through the binding core's new release features; behaviour is unchanged.

Added (lazy loading)

• IfcModel.open(path, *, mapped=False): read a file straight into the model with the GIL released; mapped=True memory-maps it (the file must not change while the model lives). Failures raise IfcError with the new code io.
• Parsed models decode entities on first access (ADR 0015), so opening a large file is several times faster and holds the file plus what was touched. IfcModel.parse now copies its input once, not twice.

Full history: crates/openbim-ifc-py/CHANGELOG.md