Add support back for Python3.8

Author: mvanderlee

.github/workflows/python-package.yml

@@ -12,10 +12,10 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"]
-        python_version: ["3.9", "3.10", "3.11", "3.12", "pypy3.10"]
+        python_version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.10"]
         include:
           - os: "ubuntu-20.04"
-            python_version: "3.9"
+            python_version: "3.8"
 
     runs-on: ${{ matrix.os }}
     steps:

.gitignore

@@ -95,6 +95,9 @@ venv.bak/
 # Rope project settings
 .ropeproject
 
+# VSCode project settings
+.vscode
+
 # mkdocs documentation
 /site
 

.pre-commit-config.yaml

@@ -3,6 +3,7 @@ repos:
   rev: v3.3.1
   hooks:
   - id: pyupgrade
+    # I've kept it on py3.7 so that it doesn't replace `Dict` with `dict`
     args: ["--py37-plus"]
 - repo: https://github.com/python/black
   rev: 23.1.0

marshmallow_dataclass/__init__.py

@@ -43,7 +43,7 @@ class User:
 import warnings
 from enum import Enum
 from functools import lru_cache, partial
-from typing import Annotated, Any, Callable, Dict, FrozenSet, List, Mapping
+from typing import Any, Callable, Dict, FrozenSet, List, Mapping
 from typing import NewType as typing_NewType
 from typing import (
     Optional,
@@ -65,6 +65,11 @@ class User:
 
 from marshmallow_dataclass.lazy_class_attribute import lazy_class_attribute
 
+if sys.version_info >= (3, 9):
+    from typing import Annotated
+else:
+    from typing_extensions import Annotated
+
 if sys.version_info >= (3, 11):
     from typing import dataclass_transform
 else:

marshmallow_dataclass/typing.py

@@ -1,7 +1,12 @@
-from typing import Annotated
+import sys
 
 import marshmallow.fields
 
+if sys.version_info >= (3, 9):
+    from typing import Annotated
+else:
+    from typing_extensions import Annotated
+
 Url = Annotated[str, marshmallow.fields.Url]
 Email = Annotated[str, marshmallow.fields.Email]
 

setup.py

@@ -1,4 +1,4 @@
-from setuptools import setup, find_packages
+from setuptools import find_packages, setup
 
 VERSION = "8.6.0"
 
@@ -8,6 +8,7 @@
     "Operating System :: OS Independent",
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
+    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -47,7 +48,7 @@
     keywords=["marshmallow", "dataclass", "serialization"],
     classifiers=CLASSIFIERS,
     license="MIT",
-    python_requires=">=3.9",
+    python_requires=">=3.8",
     install_requires=[
         "marshmallow>=3.18.0,<4.0",
         "typing-inspect>=0.8.0,<1.0",

tests/test_mypy.yml

@@ -6,7 +6,7 @@
     follow_imports = silent
     plugins = marshmallow_dataclass.mypy
     show_error_codes = true
-    python_version = 3.9
+    python_version = 3.8
   env:
     - PYTHONPATH=.
   main: |