bpo-37324: Remove ABC aliases from collections by vstinner · Pull Request #14171 · python/cpython
It seems like jinja2 should be updated:
/home/vstinner/prog/python/master/env/lib/python3.9/site-packages/jinja2/utils.py:485: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
from collections import MutableMapping
/home/vstinner/prog/python/master/env/lib/python3.9/site-packages/jinja2/runtime.py:318: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
from collections import Mapping
/home/vstinner/prog/python/master/env/lib/python3.9/site-packages/jinja2/sandbox.py:82: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
from collections import MutableSet, MutableMapping, MutableSequence