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- use @enum.property
https://docs.python.org/3/library/enum.html#enum.property
- use @enum.nonmember
Using @property on an enum class does not yield the expected result.
do_not_call_in_templates attribute works because a @property instance
is truthy. We can make this a literal True value as expected by using
@enum.nonmember in Python 3.11+.
https://docs.python.org/3/library/enum.html#enum.nonmember
- used enum.IntEnum/StrEnum
Python 3.11+ has ReprEnum which uses int.__str__() and str.__str__()
for __str__() in the `IntEnum` and `StrEnum` subclasses. We can emulate
that for Python < 3.11.
https://docs.python.org/3/library/enum.html#enum.ReprEnum
https://docs.python.org/3/library/enum.html#enum.IntEnum
https://docs.python.org/3/library/enum.html#enum.StrEnum
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Now that Python 3.10 is the minimum supported version, we can decorate
_generate_next_value_() with @staticmethod. It wasn't possible before
as Python < 3.10 does not support calling static methods direct from
the class body.
https://docs.python.org/3/library/enum.html#enum.Enum._generate_next_value_
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This also uses enum.EnumType for Python 3.11+ as Python 3.11 renamed
EnumMeta to EnumType. While the former is still available as an alias
of the latter for now, let's prefer the canonical name for this.
Check out https://docs.python.org/3/library/enum.html#enum.EnumType
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In Python 3.12 it is possible to check containment using member values,
not just the members themselves.
https://docs.python.org/3/library/enum.html#enum.EnumType.__contains__
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The Python's Steering Council decided to revert changes in the Enum
module (see https://bugs.python.org/issue44559) and moved them to
Python 3.11.
Follow up to 5d9b065d3f93de056588dfee6f1776294dd8bab2.
Thanks Nick Pope for the review.
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Enum.__repr__() was changed in [1], we should use the same format in
Python < 3.10.
[1] https://bugs.python.org/issue40066
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choice enums.
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EnumMeta has a new keyword argument 'boundary' in Python 3.10. This
is a new mechanism that controls how out-of-range / invalid bits are
handled, see https://bugs.python.org/issue38250.
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Enumeration helpers are callables, so the template system tried to call
them with no arguments.
Thanks Rupert Baker for helping discover this.
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Allows expected behavior when cast to str, also matching behaviour of
created instances with those fetched from the DB.
Thanks to Simon Charette, Nick Pope, and Shai Berger for reviews.
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These classes can serve as a base class for user enums, supporting
translatable human-readable names, or names automatically inferred
from the enum member name.
Additional properties make it easy to access the list of names, values
and display labels.
Thanks to the following for ideas and reviews:
Carlton Gibson, Fran Hrženjak, Ian Foote, Mariusz Felisiak, Shai Berger.
Co-authored-by: Shai Berger <shai@platonix.com>
Co-authored-by: Nick Pope <nick.pope@flightdataservices.com>
Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>
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