add django 3.1 classproperty

django-stubs/utils/decorators.pyi

@@ -3,6 +3,8 @@ from typing import Any, Callable, Iterable, Optional, Type, Union, TypeVar
 from django.utils.deprecation import MiddlewareMixin
 from django.views.generic.base import View
 
+from django.utils.functional import classproperty as classproperty
+
 _T = TypeVar("_T", bound=Union[View, Callable])  # Any callable
 
 class classonlymethod(classmethod): ...
@@ -12,9 +14,3 @@ def decorator_from_middleware_with_args(middleware_class: type) -> Callable: ...
 def decorator_from_middleware(middleware_class: type) -> Callable: ...
 def available_attrs(fn: Callable): ...
 def make_middleware_decorator(middleware_class: Type[MiddlewareMixin]) -> Callable: ...
-
-class classproperty:
-    fget: Optional[Callable] = ...
-    def __init__(self, method: Optional[Callable] = ...) -> None: ...
-    def __get__(self, instance: Any, cls: Optional[type] = ...) -> Any: ...
-    def getter(self, method: Callable) -> classproperty: ...

django-stubs/utils/functional.pyi

@@ -61,3 +61,9 @@ _PartitionMember = TypeVar("_PartitionMember")
 def partition(
     predicate: Callable, values: List[_PartitionMember]
 ) -> Tuple[List[_PartitionMember], List[_PartitionMember]]: ...
+
+class classproperty:
+    fget: Optional[Callable] = ...
+    def __init__(self, method: Optional[Callable] = ...) -> None: ...
+    def __get__(self, instance: Any, cls: Optional[type] = ...) -> Any: ...
+    def getter(self, method: Callable) -> classproperty: ...