Steel provides an elegant way to define binary data structures using Python type hints and field descriptors. It's designed to make working with binary file formats intuitive and type-safe.

• Declarative: Define binary structures using familiar Python class syntax
• Fully type-hinted: Leverage your IDE to interact with binary data
• Flexible: Support for different data types, sizes, and endianness
• Modern: Built for Python 3.13+ with modern typing features

pip install steel

import steel

class GIF(steel.Structure):
    magic = steel.FixedBytes(b'GIF')
    version = steel.FixedLengthString(size=3)
    width = steel.Integer(size=2)
    height = steel.Integer(size=2)

with open('logo.gif', 'rb') as f:
    image = GIF.read(f)

print(f"Version: {image.version}")
print(f"Version: {header.version}")
print(f"Size: {header.width}x{header.height}")

• Python 3.13+

pip install -e ".[dev]"

• Homepage: https://importsteel.org/
• Issues: https://github.com/gulopine/steel/issues