I've released pycups 1.9.71:
New in 1.9.71:
* Fixes for cups.IPP_JOB_CANCELED, cups.IPP_ERROR_JOB_CANCELED, cups.IPP_STATUS_ERROR_CUPS_AUTHENTICATION_CANCELED, cups.IPP_AUTHENTICATION_CANCELED, cups.IPP_STATUS_ERROR_CUPS_UPGRADE_REQUIRED, and cups.IPP_UPGRADE_REQUIRED.
Get it at PyPI: http://pypi.python.org/pypi/pycups
or here: http://cyberelk.net/tim/data/pycups/
Tim. */