diff --git a/pysollib/game.py b/pysollib/game.py
index a7b423e3..14e1eba0 100644
--- a/pysollib/game.py
+++ b/pysollib/game.py
@@ -3098,7 +3098,7 @@ Congratulations, you did it !
         try:
             game = self._loadGame(filename, self.app)
             game.gstats.holded = 0
-        except AssertionError as ex:
+        except AssertionError:
             self.updateMenus()
             self.setCursor(cursor=self.app.top_cursor)
             MfxMessageDialog(
diff --git a/pysollib/games/mahjongg/mahjongg.py b/pysollib/games/mahjongg/mahjongg.py
index 8c7542e3..f0339fc1 100644
--- a/pysollib/games/mahjongg/mahjongg.py
+++ b/pysollib/games/mahjongg/mahjongg.py
@@ -1023,7 +1023,7 @@ def r(id, short_name, name=None, ncards=144, layout=None):
     assert layout
     if not name:
         name = "Mahjongg " + short_name
-    classname = re.sub('\W', '', name)
+    classname = re.sub('\\W', '', name)
     # create class
     gameclass = type(classname, (AbstractMahjonggGame,), {})
     gameclass.L = layout
diff --git a/pysollib/hint.py b/pysollib/hint.py
index c272e116..4588f817 100644
--- a/pysollib/hint.py
+++ b/pysollib/hint.py
@@ -800,7 +800,7 @@ class Base_Solver_Hint:
         return [hint]
 
     def colonPrefixMatch(self, prefix, s):
-        m = re.match(prefix + ': (\d+)', s)
+        m = re.match(prefix + ': ([0-9]+)', s)
         if m:
             self._v = int(m.group(1))
             return True
@@ -1084,12 +1084,12 @@ class FreeCellSolver_Hint(Base_Solver_Hint):
                 print(s)
             if self._determineIfSolverState(s):
                 next
-            m = re.match('Total number of states checked is (\d+)\.', s)
+            m = re.match('Total number of states checked is ([0-9]+)\\.', s)
             if m:
                 iter_ = int(m.group(1))
                 self.dialog.setText(iter=iter_)
 
-            m = re.match('This scan generated (\d+) states\.', s)
+            m = re.match('This scan generated ([0-9]+) states\\.', s)
 
             if m:
                 states = int(m.group(1))
@@ -1102,7 +1102,7 @@ class FreeCellSolver_Hint(Base_Solver_Hint):
             move_s = m.group(1)
 
             m = re.match(
-                'the sequence on top of Stack (\d+) to the foundations',
+                'the sequence on top of Stack ([0-9]+) to the foundations',
                 move_s)
 
             if m:
@@ -1113,11 +1113,11 @@ class FreeCellSolver_Hint(Base_Solver_Hint):
                 dest = None
             else:
                 m = re.match(
-                    '(?P<ncards>a card|(?P<count>\d+) cards) '
+                    '(?P<ncards>a card|(?P<count>[0-9]+) cards) '
                     'from (?P<source_type>stack|freecell) '
-                    '(?P<source_idx>\d+) to '
+                    '(?P<source_idx>[0-9]+) to '
                     '(?P<dest>the foundations|(?P<dest_type>freecell|stack) '
-                    '(?P<dest_idx>\d+))\s*', move_s)
+                    '(?P<dest_idx>[0-9]+))\\s*', move_s)
 
                 if not m:
                     continue
@@ -1230,13 +1230,13 @@ class BlackHoleSolver_Hint(Base_Solver_Hint):
             s = six.text_type(sbytes, encoding='utf-8')
             if DEBUG:
                 print(s)
-            m = re.match('Total number of states checked is (\d+)\.', s)
+            m = re.match('Total number of states checked is ([0-9]+)\\.', s)
             if m:
                 iter_ = int(m.group(1))
                 self.dialog.setText(iter=iter_)
                 continue
 
-            m = re.match('This scan generated (\d+) states\.', s)
+            m = re.match('This scan generated ([0-9]+) states\\.', s)
 
             if m:
                 states = int(m.group(1))
diff --git a/pysollib/tk/tkstats.py b/pysollib/tk/tkstats.py
index e5e3c929..5f901691 100644
--- a/pysollib/tk/tkstats.py
+++ b/pysollib/tk/tkstats.py
@@ -170,7 +170,6 @@ class SingleGame_StatsDialog(MfxDialog):
                 x, ty[1]-dy, text="%d%%" % (100-pw), anchor="ne", font=tfont,
                 fill=fg)
 
-
 #      def _createChart3DBar(self, canvas, perc, x, y, p, col):
 #          if perc < 0.005:
 #              return
@@ -204,11 +203,6 @@ class SingleGame_StatsDialog(MfxDialog):
 #          draw_line(5, 6)
 #          draw_line(6, 7)
 #          draw_line(7, 4)
-
-    #
-    # charts
-    #
-
 #      def createSimpleChart(self, app, won, lost, text):
 #          #c, tfont, fg = self._createChartInit(frame, 300, 100, text)
 #          self._createChartInit(300, 100, text)
@@ -217,7 +211,6 @@ class SingleGame_StatsDialog(MfxDialog):
 #          tx = (90, 180, 210)
 #          ty = (21, 41, 75)
 #          self._createChartTexts(tx, ty, won, lost)
-
 #      def create3DBarChart(self, app, won, lost, text):
 #          image = app.gimages.stats[0]
 #          iw, ih = image.width(), image.height()