[New-bugs-announce] [issue46562] Add typeof or eum behavior for in the Typing module

Pedro Torres report at bugs.python.org
Fri Jan 28 08:36:09 EST 2022

New submission from Pedro Torres <corfucinas at protonmail.com>:

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] =

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"]

components: Library (Lib)
messages: 411995
nosy: Corfucinas
priority: normal
severity: normal
status: open
title: Add typeof or eum behavior for in the Typing module
type: enhancement
versions: Python 3.10

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