`from typing` vs. `from collections.abc` for standard primitive type annotation?

Question

I'm looking at the standard library documentation, and I see that from typing import Sequence is just calling collections.abc under the hood.

Now originally, there was a deprecation warning/error and migration from the collections package to collections.abc for some abstract classes. See here. However, now that the abstractions have settled in a new location, is it fine to use either? I see from collections.abc import [etc] in the codebase, and I wonder if it would be more practical to just import from typing when trying to do type annotations?

Cython source code: Sequence = _alias(collections.abc.Sequence, 1)

Use from collections.abc imports for everything that is there. "Importing those from typing is deprecated" — STerliakov
– STerliakov, Commented Mar 12, 2024 at 23:41
If you use ruff, you can write from typing import... and get it correctly moved to collections.abc and re by autofixer without typing that manually, it's quite convenient. — STerliakov
– STerliakov, Commented Mar 12, 2024 at 23:43

S.B · Accepted Answer · 2024-03-13 00:25:03Z

7

However, now that the abstractions have settled in a new location, is it fine to use either?

It's better not to do so. The documentation specifically says:

class typing.Sequence(Reversible[T_co], Collection[T_co])

Deprecated alias to collections.abc.Sequence.

Deprecated since version 3.9: collections.abc.Sequence now supports subscripting ([])

If it's deprecated, it may be removed in the next versions of Python. So go with collections.abc generic classes.

answered Mar 13, 2024 at 0:25

S.B

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