Of course, the extension shouldn't be part of the import...

eessi/testsuite/__init__.py

@@ -1,12 +1,10 @@
 from importlib.metadata import version, PackageNotFoundError
+# If this is an installed package, setuptools_scm should have written the file _version.py in the current directory
 try:
-    from . import _version.py
+    from . import _version
 except ImportError:
-# We probably no longer needed this: if it is an installed package, we can read the version from _version.py
-# try:
-#     __version__ = version("eessi-testsuite")
-# except PackageNotFoundError:
-    # Fallback for when it is not an installed package, but is a git clone
+    # Fallback for when the package is not installed, but git cloned. Note that this requires setuptools_scm to be
+    # available as a runtime dependency
     try:
         from setuptools_scm import get_version
         # Using a relative path for relative_to doesn't work, because it will be relative to the current working