Add sqlalchemy.__version__ attribute

Author: amotl

pyproject.toml

@@ -84,6 +84,7 @@ dependencies = [
   "backports.zoneinfo<1; python_version<'3.9'",
   "crate>=2,<3",
   "geojson<4,>=2.5",
+  "importlib-metadata; python_version<'3.8'",
   "importlib-resources; python_version<'3.9'",
   "sqlalchemy<2.1,>=1",
   "verlib2<0.3",

src/sqlalchemy_cratedb/__init__.py

@@ -52,7 +52,22 @@
     monkeypatch_add_exec_driver_sql()
 
 
+try:
+    from importlib.metadata import PackageNotFoundError, version
+except (ImportError, ModuleNotFoundError):  # pragma:nocover
+    from importlib_metadata import (  # type: ignore[assignment,no-redef,unused-ignore]
+        PackageNotFoundError,
+        version,
+    )
+
+try:
+    __version__ = version("sqlalchemy-cratedb")
+except PackageNotFoundError:  # pragma: no cover
+    __version__ = "unknown"
+
+
 __all__ = [
+    __version__,
     dialect,
     FloatVector,
     Geopoint,