Project versioning: Provide module version via importlib.metadata

>>> import crate.client
>>> crate.client.__version__
'2.0.0.post43+g7ceffbb.d20251220'

Author: amotl

pyproject.toml

@@ -34,6 +34,7 @@ classifiers = [
         "Topic :: Database",
 ]
 dependencies = [
+    "importlib-metadata; python_version<'3.8'",
     "orjson>=3.11.3",
     "urllib3",
     "verlib2>=0.3.1",

src/crate/client/__init__.py

@@ -27,9 +27,21 @@
     "Error",
 ]
 
-# version string read from setup.py using a regex. Take care not to break the
-# regex!
-__version__ = "2.0.0"
+# ruff: noqa: E402
+try:
+    from importlib.metadata import PackageNotFoundError, version
+except (ImportError, ModuleNotFoundError):  # pragma: no cover
+    from importlib_metadata import (  # type: ignore[assignment,no-redef,unused-ignore]
+        PackageNotFoundError,
+        version,
+    )
+
+__appname__ = "crate"
+
+try:
+    __version__ = version(__appname__)
+except PackageNotFoundError:  # pragma: no cover
+    __version__ = "unknown"
 
 # codeql[py/unused-global-variable]
 apilevel = "2.0"