MutableMapping deprecated in Python 3.10

[firewavemtl]

Hi,

ImportError: cannot import name 'MutableMapping' from 'collections' (/usr/lib64/python3.10/collections/__init__.py)

Deprecated since version 3.3, removed in version 3.10: Moved Collections Abstract Base Classes to the collections.abc module. For backwards compatibility, they continue to be visible in this module through Python 3.9.

Something like this should be done as a quick patch:

import collections
from collections import abc
collections.MutableMapping = abc.MutableMapping

But we probably should consider a better solution.