get version without deprecation warnings

merges #29

* Make getting version Python 3.8+ compatible
* Bump minimum Python version to 3.8

.github/workflows/build.yaml

@@ -13,7 +13,7 @@ jobs:
         - windows-latest
         - macOS-latest
         python-version:
-        - "3.7"
+        - "3.8"
         - "3.11"
         networkx-version:
         - "1.*"

obonet/__init__.py

@@ -8,12 +8,11 @@
 
 
 def _get_version() -> str | None:
-    # https://github.com/pypa/setuptools_scm#retrieving-package-version-at-runtime
-    from pkg_resources import DistributionNotFound, get_distribution
+    from importlib.metadata import PackageNotFoundError, version
 
     try:
-        return str(get_distribution("obonet").version)
-    except DistributionNotFound:
+        return version("obonet")
+    except PackageNotFoundError:
         return None
 
 

pyproject.toml

@@ -28,7 +28,7 @@ keywords = [
     "parser",
     "network",
 ]
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 dependencies = ["networkx"]
 dynamic = ["version"]
 
@@ -54,7 +54,7 @@ include-package-data = true
 license-files = ["LICENSE.md"]
 
 [tool.ruff]
-target-version = "py37"
+target-version = "py38"
 ignore = [
     "E501",  # line-too-long (black should handle)
 ]