Update python/examples/6-explore.py

Co-authored-by: Guillaume Fraux <[email protected]>

python/examples/6-explore.py

@@ -125,7 +125,9 @@ def fetch_dataset(filename, base_url="https://zenodo.org/records/12748925/files/
 # if they were provided to the :py:func:`chemiscope.explore`.
 
 
-def soap_kpca_featurize(frames, _environments):
+def soap_kpca_featurize(frames, environments):
+    if environments is not None:
+        raise ValueError("'environments' are not supported")
     # Initialise soap calculator. The detailed explanation of the provided
     # hyperparameters can be checked in the documentation of the library (``dscribe``).
     soap = SOAP(