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Make type aliases compatible with old Python versions

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Maarten ter Huurne 2024-04-10 18:24:37 +02:00
parent 2b0b4827a5
commit 713a3fec88
1 changed files with 16 additions and 9 deletions
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25
model_utils/choices.py
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@ -8,22 +8,29 @@ T = TypeVar("T")
if TYPE_CHECKING: if TYPE_CHECKING:
from collections.abc import Iterable, Iterator, Sequence from collections.abc import Iterable, Iterator, Sequence
# The type aliases defined here are evaluated when the django-stubs mypy plugin
# loads this module, so they must be able to execute under the lowest supported
# Python VM:
# - typing.List, typing.Tuple become obsolete in Pyton 3.9
# - typing.Union becomes obsolete in Pyton 3.10
from typing import List, Tuple, Union
from django_stubs_ext import StrOrPromise from django_stubs_ext import StrOrPromise
# The type argument 'T' to 'Choices' is the database representation type. # The type argument 'T' to 'Choices' is the database representation type.
_Double = tuple[T, StrOrPromise] _Double = Tuple[T, StrOrPromise]
_Triple = tuple[T, str, StrOrPromise] _Triple = Tuple[T, str, StrOrPromise]
_Group = tuple[StrOrPromise, Sequence["_Choice[T]"]] _Group = Tuple[StrOrPromise, Sequence["_Choice[T]"]]
_Choice = _Double[T] | _Triple[T] | _Group[T] _Choice = Union[_Double[T], _Triple[T], _Group[T]]
# Choices can only be given as a single string if 'T' is 'str'. # Choices can only be given as a single string if 'T' is 'str'.
_GroupStr = tuple[StrOrPromise, Sequence["_ChoiceStr"]] _GroupStr = Tuple[StrOrPromise, Sequence["_ChoiceStr"]]
_ChoiceStr = str | _Double[str] | _Triple[str] | _GroupStr _ChoiceStr = Union[str, _Double[str], _Triple[str], _GroupStr]
# Note that we only accept lists and tuples in groups, not arbitrary sequences. # Note that we only accept lists and tuples in groups, not arbitrary sequences.
# However, annotating it as such causes many problems. # However, annotating it as such causes many problems.
_DoubleRead = _Double[T] | tuple[StrOrPromise, Iterable["_DoubleRead[T]"]] _DoubleRead = Union[_Double[T], Tuple[StrOrPromise, Iterable["_DoubleRead[T]"]]]
_DoubleCollector = list[_Double[T] | tuple[StrOrPromise, "_DoubleCollector[T]"]] _DoubleCollector = List[Union[_Double[T], Tuple[StrOrPromise, "_DoubleCollector[T]"]]]
_TripleCollector = list[_Triple[T] | tuple[StrOrPromise, "_TripleCollector[T]"]] _TripleCollector = List[Union[_Triple[T], Tuple[StrOrPromise, "_TripleCollector[T]"]]]
class Choices(Generic[T]): class Choices(Generic[T]):