Suggest using collections.abc etc, not typing (deprecated since 3.9)

[srittau]

Affects:

• AbstractSet (as collections.abc.Set)
• AsyncContextManager (as contextlib.AbstractAsyncContextManager)
• AsyncGenerator
• AsyncIterable
• AsyncIterator
• Awaitable
• ByteString
• Callable
• ChainMap (as collections.ChainMap)
• Collection
• Container
• ContextManager (as contextlib.AbstractContextManager)
• Coroutine
• Counter (as collections.Counter)
• DefaultDict (as collections.defaultdict)
• Deque (as collections.Deque)
• Generator
• Hashable
• ItemsView
• Iterable
• Iterator
• KeysView
• Mapping
• MappingView
• Match (as re.Match)
• MutableMapping
• MutableSequence
• MutableSet
• OrderedDict (as collections.OrderedDict)
• Pattern (as re.Pattern)
• Reversible
• Sequence
• Sized
• ValuesView

[AlexWaygood]

The collections.abc alias checks cannot be implemented until these two bugs are resolved:

• Crash when (Mutable)Sequence is imported from collections.abc in typeshed/stdlib/builtins.pyi python/mypy#11860
• Many pytype errors when importing classes from collections.abc instead of typing in typeshed google/pytype#1096

We can't suggest using re.Match and re.Pattern until typeshed drops support for Python 3.6 (they were only exposed in the re module in 3.7).

[AlexWaygood]

The only two left to do here are typing.Match and typing.Pattern. We can't check for that in typeshed until we drop support for 3.6, since re.Match and re.Pattern don't exist in Python 3.6, but I suppose we could add a check here before then.