Python Type Hints#

typing module vs collections module#

Since Python 3.9, most of types in typing module is deprecated, and collections module is recommended.

Some types like: typing.Any, typing.Generic, typing.TypeVar, etc. are still not deprecated.

Deprecated Alias	Replacement
`typing.Pattern`	`re.Pattern`
`typing.Match`	`re.Match`
`typing.Text`	`str`
`typing.ByteString`	`collections.abc.Buffer` or union like `bytes \| bytearray \| memoryview`

Deprecated Alias	Replacement
`typing.AbstractSet`	`collections.abc.Set`
`typing.Collection`	`collections.abc.Collection`
`typing.Container`	`collections.abc.Container`
`typing.ItemsView`	`collections.abc.ItemsView`
`typing.KeysView`	`collections.abc.KeysView`
`typing.Mapping`	`collections.abc.Mapping`
`typing.MappingView`	`collections.abc.MappingView`
`typing.MutableMapping`	`collections.abc.MutableMapping`
`typing.MutableSequence`	`collections.abc.MutableSequence`
`typing.MutableSet`	`collections.abc.MutableSet`
`typing.Sequence`	`collections.abc.Sequence`
`typing.ValuesView`	`collections.abc.ValuesView`

Deprecated Alias	Replacement
`typing.Coroutine`	`collections.abc.Coroutine`
`typing.AsyncGenerator`	`collections.abc.AsyncGenerator`
`typing.AsyncIterable`	`collections.abc.AsyncIterable`
`typing.AsyncIterator`	`collections.abc.AsyncIterator`
`typing.Awaitable`	`collections.abc.Awaitable`

Deprecated Alias	Replacement
`typing.ContextManager`	`contextlib.AbstractContextManager`
`typing.AsyncContextManager`	`contextlib.AbstractAsyncContextManager`

collections.abc.Sequence is a type of ordered collection. Sequence does not include append and extend methods.
collections.abc.Collection is a type of unordered collection.

(Python 3.9+) Both typing.Sequence and typing.Collection are deprecated aliases.