Add dunder version to top-level __init__.py

pyproject.toml

@@ -61,11 +61,7 @@ requires = [
 ]
 
 [tool.setuptools_scm]
-write_to = "virtualizarr/_version.py"
-write_to_template = '''
-# Do not change! Do not track in version control!
-__version__ = "{version}"
-'''
+fallback_version = "9999"
 
 [tool.setuptools.packages.find]
 exclude = ["docs", "tests", "tests.*", "docs.*"]

virtualizarr/__init__.py

@@ -1,3 +1,12 @@
 from .manifests import ChunkManifest, ManifestArray  # type: ignore # noqa
 from .xarray import VirtualiZarrDatasetAccessor  # type: ignore # noqa
 from .xarray import open_virtual_dataset  # noqa: F401
+
+from importlib.metadata import version as _version
+
+try:
+    __version__ = _version("virtualizarr")
+except Exception:
+    # Local copy or not installed with setuptools.
+    # Disable minimum version checks on downstream libraries.
+    __version__ = "9999"