export __version__ from package root

Author: maxscheurer

src/cppe/__init__.py

@@ -2,7 +2,18 @@
 from .pycppe import __build_type__, __parallel__
 from .pycppe.tensors import *
 
+try:
+    from ._version import version as __version__
+except Exception:
+    try:
+        from importlib.metadata import version as _pkg_version
+
+        __version__ = _pkg_version("cppe")
+    except Exception:
+        __version__ = "0+unknown"
+
 all = [
     "__build_type__",
     "__parallel__",
+    "__version__",
 ]