Upgrade to Python 3.12 (#1252)

Author: Dreamsorcerer

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.9
+        python-version: 3.12
         cache: 'pip'
         cache-dependency-path: '**/requirements*.txt'
     - name: Install dependencies
@@ -67,7 +67,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v5
       with:
-        python-version: 3.9
+        python-version: 3.12
         cache: 'pip'
         cache-dependency-path: '**/requirements*.txt'
     - name: Install dependencies

demos/blog/aiohttpdemo_blog/db.py

@@ -1,6 +1,7 @@
-from datetime import datetime
+from datetime import datetime, UTC
+from functools import partial
 
-from sqlalchemy import ForeignKey, String
+from sqlalchemy import DateTime, ForeignKey, String
 from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.orm import (
     DeclarativeBase,
@@ -36,7 +37,8 @@ class Posts(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True)
     body: Mapped[str] = mapped_column(String(140))
-    timestamp: Mapped[datetime] = mapped_column(index=True, default=datetime.utcnow)
+    timestamp: Mapped[datetime] = mapped_column(DateTime(timezone=True), index=True,
+                                                default=partial(datetime.now, UTC))
 
     user_id: Mapped[int] = mapped_column(ForeignKey("users.id"))
     user: Mapped[Users] = relationship(back_populates="posts", lazy="raise_on_sql")

demos/motortwit/motortwit/views.py

@@ -180,5 +180,5 @@ async def add_message(self, request):
                  'email': user['email'],
                  'username': user['username'],
                  'text': form['text'],
-                 'pub_date': datetime.datetime.utcnow()})
+                 'pub_date': datetime.datetime.now(datetime.UTC)})
         return redirect(request, 'timeline')