Please review this PR.
The collections.Callable class which is used in rlwrapfilter.py was copied
to the collections.abc package and had been marked as deprecated since Python
3.3 through 3.9. In Python 3.10, it was finally removed. This fix is for
supporting the latest Python using collections.abc.Callable in rlwrapfilter.py
and providing backward compatibility for running on older versions of Python as
well.
Please review this PR. The collections.Callable class which is used in rlwrapfilter.py was copied to the collections.abc package and had been marked as deprecated since Python 3.3 through 3.9. In Python 3.10, it was finally removed. This fix is for supporting the latest Python using collections.abc.Callable in rlwrapfilter.py and providing backward compatibility for running on older versions of Python as well.