init file with export class

abstract_data_layer/__init__.py

@@ -0,0 +1,5 @@
+from .category import CategoryRepository, Category
+
+category = CategoryRepository()
+
+__all__ = [Category, category]

abstract_data_layer/base.py

@@ -18,13 +18,14 @@
 from typing import TypeVar, Generic, Protocol, List
 
 ID = TypeVar('ID')
-T = TypeVar('T')
 
+class Entity(Generic[ID]):
+    def __init__(self, id: ID, create_date: datetime = datetime.now(), update_date: datetime = None):
+        self.id = id
+        self.create_date = create_date
+        self.update_date = update_date
 
-class Entity(Protocol):
-    createDate: datetime
-    updateDate: datetime
-
+T = TypeVar('T', bound=Entity)
 
 class CRUD(Generic[T, ID]):
 
@@ -44,7 +45,6 @@ def create(self, obj: T) -> T:
     def update(self, obj: T) -> T:
         pass
 
-
 class SortOrder(Enum):
     ASC = 1
     DESC = 2

abstract_data_layer/category.py

@@ -13,5 +13,4 @@ def __init__(self, id: ID = None, name: str = None, description: str = None, col
 
 
 class CategoryRepository(CRUD[Category[ID], ID], ABC):
-    def __init__(self):
-        pass
+    pass