Allow StrEnum from backports for python <3.11

.github/workflows/unit_tests.yml

@@ -36,6 +36,11 @@ jobs:
         run: |
           pip install backports.zoneinfo
 
+      - name: Backport StrEnum
+        if: matrix.python-version < '3.11'
+        run: |
+          pip install backports.strenum
+
       - name: Test with pytest
         run: |
           python -m pytest tests

eos/options.py

@@ -3,7 +3,6 @@ Classes for stroing various configurations needed for reduction.
 """
 import argparse
 from dataclasses import dataclass, field, Field, fields, MISSING
-from enum import StrEnum
 from typing import get_args, get_origin, List, Optional, Tuple, Union
 from datetime import datetime
 from os import path
@@ -11,6 +10,11 @@ import numpy as np
 
 import logging
 
+try:
+    from enum import StrEnum
+except ImportError:
+    from backports.strenum import StrEnum
+
 @dataclass
 class CommandlineParameterConfig:
     argument: str # default parameter for command line resutign ins "--argument"