fix character index in ExtendedInterpolation's exception message
fix character index in ExtendedInterpolation's exception message
backported rev 79713 from 3.4, test_recursion_limit skipped for -O0
null merge
clean the environment from pre-existing PYTHONWARNINGS for test_warnings
clean the environment from pre-existing PYTHONWARNINGS for test_warnings
Revert c9674421d78e, leaving an additional comment