All collection ABCs have been moved to collections.abc in Python 3.3. Since Python 3.7, imports from collections raise a deprecation warning. Pylint also complains: ipaclient/remote_plugins/schema.py:42: [E1101(no-member), ] Module 'collections' has no 'Sequence' member). Also see https://docs.python.org/3/library/collections.html#module-collections

Changed in version 3.3: Moved Collections Abstract Base Classes to the collections.abc module. For backwards compatibility, they continue to be visible in this module through Python 3.7. Subsequently, they will be removed entirely.

TODO: Fix all imports to import from collections.abc under Python 3. This needs to be fixed soonish, because F29 will use Python 3.7, https://fedoraproject.org/wiki/Changes/Python3.7