fix setup and backport

Author: rettinghaus

csv2cmi.py

@@ -16,7 +16,6 @@
 from csv import DictReader
 from datetime import datetime
 from email.utils import parseaddr
-from enum import StrEnum
 from pathlib import Path
 from secrets import token_hex
 from typing import Optional
@@ -27,6 +26,11 @@
 __version__ = "3.0.0-alpha"
 __author__ = "Klaus Rettinghaus"
 
+if sys.version_info >= (3, 11):
+    from enum import StrEnum
+else:
+    from backports.strenum import StrEnum
+
 # define log output
 logging.basicConfig(format="%(levelname)s: %(message)s")
 logs = logging.getLogger()

pyproject.toml

@@ -5,6 +5,10 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "csv2cmi"
 dynamic = ["version"]
+dependencies = [
+    "backports.strenum; python_version < '3.11'",
+]
+requires-python = ">= 3.8"
 authors = [{name = "Klaus Rettinghaus"}]
 description = "converts a table of letters into CMI format"
 readme = {file = "README.md", content-type = "text/markdown"}
@@ -22,5 +26,8 @@ keywords = ["TEI", "CSV", "CMIF", "digital humanities", "correspondence"]
 [tool.ruff]
 line-length = 120
 
+[tool.setuptools]
+py-modules = ["csv2cmi"]
+
 [tool.setuptools.dynamic]
-version = {attr = "package.__version__"}
+version = {attr = "csv2cmi.__version__"}