The pythoncapi-compat project can be used to write a C or C++ extension supporting a wide range of Python versions with a single code base. It is made of the pythoncapi_compat.h header file and the upgrade_pythoncapi.py script.

upgrade_pythoncapi.py requires Python 3.6 or newer.

See the documentation at ReadTheDocs for more details.

To upgrade a specific file:

python3 upgrade_pythoncapi.py module.c

To upgrade all C/C++ files in a directory:

python3 upgrade_pythoncapi.py src/

To only replace op->ob_type with Py_TYPE(op), select the Py_TYPE operation with:

python3 upgrade_pythoncapi.py -o Py_TYPE module.c

Or the opposite, to apply all operations but leave op->ob_type unchanged, deselect the Py_TYPE operation with:

python3 upgrade_pythoncapi.py -o all,-Py_TYPE module.c

If you want to pythoncapi_compat.h to your code base, use the upgrade_pythoncapi.py tool to fetch it:

python3 upgrade_pythoncapi.py --download PATH

This project is distributed under the Zero Clause BSD (0BSD) license and is covered by the PSF Code of Conduct.