Currently, the addition of Annotated in PEP 593 on Python 3.9 allows adding arbitrary metadata for type hints.

Let's consider the following

time_available_online: list[str] =
[
'1m',
'5m',
'1d'
]


```
Hour = Annotated(str, "time available online")

```

Another way to consider this is if the selection was an Enum, since we know the only available options that can be selected (ie. it is not all possible 'str', only the 'str' from a list, which can be defined by the user)

It would save time and simplify things if the following was possible.

---

from typing import Enum  # we save time by not making a duplicate Class, or converting a constant variable to a Class


```
Hour = Enum[time_available_online, "time available online"]
```

Thanks for your report!

I think you're looking for the Literal type.

Also, new typing behaviors are better discussed first on https://github.com/python/typing or the typing-sig mailing list.