Python >= 3.9

Author: scivision

.github/workflows/ci_stdlib_only.yml

@@ -16,8 +16,8 @@ jobs:
     name: ${{ matrix.os }} Python ${{ matrix.python-version }}
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
-        os: ['ubuntu-22.04']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        os: ['ubuntu-latest']
         include:
         - os: macos-latest
           python-version: '3.13'

pyproject.toml

@@ -14,7 +14,7 @@ classifiers = ["Development Status :: 5 - Production/Stable",
  "Programming Language :: Python :: 3",
  "Topic :: Scientific/Engineering :: GIS"
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dynamic = ["version", "readme"]
 
 [tool.setuptools.dynamic]

src/pymap3d/ellipsoid.py

@@ -2,14 +2,8 @@
 
 from __future__ import annotations
 from math import sqrt
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from typing import TypedDict
-import sys
-
-if sys.version_info < (3, 9):
-    from typing import Dict
-else:
-    Dict = dict
 
 
 class Model(TypedDict):
@@ -66,7 +60,7 @@ class Ellipsoid:
     flattening: float
     thirdflattening: float
     eccentricity: float
-    models = field(default_factory=Dict[str, Model])
+    models: dict[str, Model]
 
     def __init__(
         self,