diff --git a/common/lib/chem/chem/chemcalc.py b/common/lib/chem/chem/chemcalc.py
index 3164a568da..196c99ae5c 100644
--- a/common/lib/chem/chem/chemcalc.py
+++ b/common/lib/chem/chem/chemcalc.py
@@ -33,9 +33,12 @@ tokenizer = OneOrMore(tokens) + StringEnd()
 # other applications.
 # See LEARNER-5853 for more details.
 Text = markupsafe.escape                        # pylint: disable=invalid-name
+
+
 def HTML(html):                                 # pylint: disable=invalid-name
     return markupsafe.Markup(html)
 
+
 def _orjoin(l):
     return "'" + "' | '".join(l) + "'"