Admin: Drop support for Python 3.8 (#8617)

Author: bblommers

.github/workflows/build.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ 3.8, 3.9, "3.10", "3.11", "3.12", "3.13" ]
+        python-version: [ 3.9, "3.10", "3.11", "3.12", "3.13" ]
 
     steps:
       - uses: actions/checkout@v4
@@ -42,7 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12", "3.13"]
+        python-version: [3.9, "3.10", "3.11", "3.12", "3.13"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}

.github/workflows/release.yml

@@ -29,10 +29,10 @@ jobs:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: 3.12
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

.github/workflows/tests_decoratormode.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12", "3.13"]
+        python-version: [3.9, "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/tests_sdk_dotnet.yml

@@ -9,10 +9,10 @@ jobs:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.12"
     - name: Start MotoServer
       run: |
         pip install build

.github/workflows/tests_sdk_java.yml

@@ -9,10 +9,10 @@ jobs:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v5
       with:
-        python-version: "3.10"
+        python-version: "3.12"
     - name: Start MotoServer
       run: |
         pip install build

.github/workflows/tests_sdk_ruby.yml

@@ -16,10 +16,10 @@ jobs:
         uses: ruby/setup-ruby@32110d4e311bd8996b2a82bf2a43b714ccc91777
         with:
           ruby-version: ${{ matrix.ruby-version }}
-      - name: Set up Python 3.8
+      - name: Set up Python 3.12
         uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
+          python-version: "3.12"
       - name: Start MotoServer
         run: |
           pip install build

.github/workflows/tests_servermode.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, "3.10", "3.11", "3.12"]
+        python-version: [3.9, "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/tests_terraform_examples.yml

@@ -34,10 +34,10 @@ jobs:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 0
-    - name: Set up Python 3.8
+    - name: Set up Python 3.12
       uses: actions/setup-python@v5
       with:
-        python-version: "3.8"
+        python-version: "3.12"
     - name: Start MotoServer
       run: |
         pip install build

moto/core/base_backend.py

@@ -1,6 +1,5 @@
 import re
 import string
-import sys
 from functools import lru_cache
 from threading import RLock
 from typing import (
@@ -29,15 +28,6 @@
 if TYPE_CHECKING:
     from moto.core.common_models import BaseModel
 
-    if sys.version_info >= (3, 9):
-        from builtins import type as Type
-    else:
-        # https://github.com/python/mypy/issues/10068
-        # Legacy generic type annotation classes
-        # Deprecated in Python 3.9
-        # Remove once we no longer support Python 3.8 or lower
-        from typing import Type
-
 
 class InstanceTrackerMeta(type):
     def __new__(meta, name: str, bases: Any, dct: Dict[str, Any]) -> type:
@@ -339,7 +329,7 @@ def reset(cls) -> None:
 
     def __init__(
         self,
-        backend: "Type[SERVICE_BACKEND]",
+        backend: type[SERVICE_BACKEND],
         service_name: str,
         use_boto3_regions: bool = True,
         additional_regions: Optional[List[str]] = None,

moto/core/exceptions.py

@@ -101,9 +101,7 @@ def to_json(self) -> "JsonRESTError":
 
     @classmethod
     def extended_environment(cls, extended_templates: Dict[str, str]) -> Environment:
-        # Can be simplified to cls.templates | extended_templates when we drop Python 3.8 support
-        # https://docs.python.org/3/library/stdtypes.html#mapping-types-dict
-        templates = dict(cls.templates.items() | extended_templates.items())
+        templates = cls.templates | extended_templates
         return Environment(loader=DictLoader(templates))