# py3c: Python 2/3 compatibility layer for C extensions

This is py3c, a library for easing porting C extensions to Python 3, providing macros for single-source compatibility between Python 2.6, 2.7, and 3.3+. It could be described as “the six for C extensions”.

Pick the docs you wish to read:

- Porting guide

  > A detailed walkthrough for porting to Python 3. Read if you wish to start porting a C extension to Python 3.

- Cheatsheet

  > A quick reference, helpful if you’re in the middle of porting. Also useful if you find yourself working on a project that someone else is porting, and don’t understand what’s going on.

  > If you want something to print out a stick on your wall, use this – compared to the other docs, you’ll save trees.

- Definition Summary

  > A table summarizing how py3c’s macros are defined. Convenient if you already know the differences between Python 2 and 3, or before a dive into py3c’s internals.

  > Also serves as a summary of where py3c provides the Python 3 API, and where it resorts to inventing its own macros.

- Reference

  > Lists every macro py3c defines. The search will point you here when it finds a term.

- Index and Search

  > Head here if you’re looking for something specific.

# Project info

The py3c library is available under the MIT license. This documentation is available under the Creative Commons Attribution-ShareAlike 3.0 Unported license. May they serve you well.

The high-level history of py3c is chronicled in the Changelog.

If you’d like to contribute code, words, suggestions, bug reports, or anything else, do so at the Github page. For more info, see Contributing.

Oh, and you should pronounce “py3c” with a hard “c”, if you can manage to do so.