Check version without installing dependencies

.github/check_version_uniqueness.py

@@ -1,10 +1,9 @@
 """Make sure that the version number has been increased and does not exist on PyPI yet."""
 
+import importlib.metadata
 import subprocess
 
-import pysweepme
-
-pysweepme_version = pysweepme.__version__
+pysweepme_version = importlib.metadata.version("pysweepme")
 
 not_found = False
 
@@ -29,4 +28,5 @@
         f"Version {pysweepme_version} seems to be published already. "
         f"Did you forget to increase the version number in pysweepme/__init__.py?"
     )
+    print(f"::error::{exc_msg}")  # noqa: T201
     raise ValueError(exc_msg)

.github/workflows/check_version.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Install environment
       run: |
         python -m pip install --upgrade pip
-        pip install .
+        pip install --no-deps .
     - name: Run version check
       run: |
         python .github/check_version_uniqueness.py