Replace pkg_resources with importlib (#186)

* Replace pkg_resources with importlib

* Add Python 3.12 to CI tests, drop 3.9

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.10', '3.11', '3.12']
     steps:
       - uses: actions/checkout@v4
       - name: Create conda environment

ecgtools/__init__.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python
 # flake8: noqa
 """Top-level module for ecgtools ."""
-from pkg_resources import DistributionNotFound, get_distribution
+from importlib.metadata import PackageNotFoundError, version
 
 from .builder import Builder, RootDirectory, glob_to_regex
 
 try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:
+    __version__ = version(__name__)
+except PackageNotFoundError:
     # package is not installed
     __version__ = '0.0.0'

setup.cfg

@@ -7,7 +7,7 @@ select = B,C,E,F,W,T4,B9
 
 [isort]
 known_first_party=ecgtools
-known_third_party=cf_xarray,joblib,pandas,pkg_resources,pydantic,pytest,setuptools,xarray
+known_third_party=cf_xarray,joblib,pandas,pydantic,pytest,setuptools,xarray
 multi_line_output=3
 include_trailing_comma=True
 force_grid_wrap=0