diff --git a/common/lib/symmath/symmath/formula.py b/common/lib/symmath/symmath/formula.py
index ba6debfbe0..2691853769 100644
--- a/common/lib/symmath/symmath/formula.py
+++ b/common/lib/symmath/symmath/formula.py
@@ -90,8 +90,8 @@ def to_latex(expr):
 
     #return '<math>%s{}{}</math>' % (xs[1:-1])
     if expr_s[0] == '$':
-        return '[mathjax]%s[/mathjax]<br>' % (expr_s[1:-1])	 # for sympy v6
-    return '[mathjax]%s[/mathjax]<br>' % (expr_s)		# for sympy v7
+        return '[mathjax]%s[/mathjax]<br>' % (expr_s[1:-1])	 # for sympy v6  # xss-lint: disable=python-interpolate-html
+    return '[mathjax]%s[/mathjax]<br>' % (expr_s)		# for sympy v7  # xss-lint: disable=python-interpolate-html
 
 
 def my_evalf(expr, chop=False):
@@ -138,7 +138,7 @@ def my_sympify(expr, normphase=False, matrix=False, abcsym=False, do_qubit=False
             'bit': sympy.Function('bit'),
         })
     if abcsym:			# consider all lowercase letters as real symbols, in the parsing
-        for letter in string.lowercase:
+        for letter in string.ascii_lowercase:
             if letter in varset:	 # exclude those already done
                 continue
             varset.update({letter: sympy.Symbol(letter, real=True)})
diff --git a/openedx/core/lib/xblock_builtin/xblock_discussion/tests.py b/openedx/core/lib/xblock_builtin/xblock_discussion/tests.py
index 357158a755..b1eab56fd3 100644
--- a/openedx/core/lib/xblock_builtin/xblock_discussion/tests.py
+++ b/openedx/core/lib/xblock_builtin/xblock_discussion/tests.py
@@ -39,7 +39,7 @@ def _random_string():
     """
     Generates random string
     """
-    return ''.join(random.choice(string.lowercase, ) for _ in range(12))
+    return ''.join(random.choice(string.ascii_lowercase, ) for _ in range(12))
 
 
 def _make_attribute_test_cases():