try running plain script

.github/workflows/run-tests.yaml

@@ -30,6 +30,9 @@ jobs:
         pip install Cython==3.0.3
         pip install -r requirements.txt
         pip install -v .
+    - name: Run Script
+      run: |
+        python job.py
     - name: Test with pytest
       run: |
         py.test -l -s -v ./tests --cov=glypy --cov-report=html --cov-report term

job.py

@@ -0,0 +1,7 @@
+import glypy
+
+print(glypy)
+from glypy.structure import glycan_composition
+
+x = glycan_composition.GlycanComposition(Hex=6, HexNAc=2)
+print(x)