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A Python package to read/write STEP data files.

Project description




STEPutils is a Python package to manage STEP model data.

The intention of this package is to build a simple document object model (DOM) for STEP model data like xml.etree.ElementTree for XML data. STEPutils could be used as import/export layer for CAD like application. The DOM has methods to traverse, create and delete object nodes but no further CAD-like functionality like translating, scaling or rotating objects, if you need that - you are looking for a CAD application like FreeCAD.

For more information about the STEP (ISO 10303) standard read this Wikipedia article.


  • Python package to manage a simple document object model (DOM) for STEP model data
  • the intended audience are developers
  • requires at least Python 3.7
  • OS independent
  • tested with GitHub actions for windows-latest and linux-latest
  • MIT-License


Install with pip for Python 3.7 and later:

pip install steputils

Install latest development version with pip from GitHub:

pip install git+

or from source:

python install



The source code of STEPutils can be found at GitHub, target your pull requests to the master branch:


Version 0.1b0

  • BUGFIX: #3 multiline string support

Version 0.1a5

  • EXPRESS parser implemented with antlr4

Version 0.1a2

  • optimized STEP-file loader and serializer, speed gain about 7x
  • renamed module stepfile into p21 and implemented factory functions at module level

Version 0.1a1

  • pre-alpha state
  • STEP-file loader and serializer works

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