diff --git a/core/goodreads.py b/core/goodreads.py
index bcafcdae..96f64e75 100644
--- a/core/goodreads.py
+++ b/core/goodreads.py
@@ -38,7 +38,7 @@ class GoodreadsAuthorizationRequired(GoodreadsException):
 
 def filter_none(d):
     d2 = {}
-    for (k,v) in d.iteritems():
+    for (k,v) in d.items():
         if v is not None:
             d2[k] = v
     return d2
diff --git a/core/loaders/routledge.py b/core/loaders/routledge.py
index 81fd5fa9..808c7a65 100644
--- a/core/loaders/routledge.py
+++ b/core/loaders/routledge.py
@@ -108,7 +108,7 @@ def load_routledge():
                 books[book_url] = new_book
             else:
                 books[book_url].metadata['subjects'].append(subject)
-    print("Harvesting %s books" % len(books.values()))
+    print("Harvesting %s books" % len(list[books.values()]))
     add_from_bookdatas(books.values())
     return books
     
\ No newline at end of file
diff --git a/core/models/__init__.py b/core/models/__init__.py
index 4341d8bc..68772bfe 100755
--- a/core/models/__init__.py
+++ b/core/models/__init__.py
@@ -878,9 +878,9 @@ class Campaign(models.Model):
         if time_remaining.days:
             countdown = "%s days" % str(time_remaining.days + 1)
         elif time_remaining.seconds > 3600:
-            countdown = "%s hours" % str(time_remaining.seconds/3600 + 1)
+            countdown = "%s hours" % str(time_remaining.seconds // 3600 + 1)
         elif time_remaining.seconds > 60:
-            countdown = "%s minutes" % str(time_remaining.seconds/60 + 1)
+            countdown = "%s minutes" % str(time_remaining.seconds // 60 + 1)
         else:
             countdown = "Seconds"
 
@@ -1249,7 +1249,7 @@ class UserProfile(models.Model):
             if member['status'] == 'subscribed':
                 return 'True'
         except MailChimpError as e:
-            if e[0]['status'] != 404: # don't log case where user is not on a list
+            if e.args[0]['status'] != 404: # don't log case where user is not on a list
                 logger.error("error getting mailchimp status  %s" % (e))
         except ValueError as e:
             logger.error("bad email address  %s" % (self.user.email))
@@ -1275,7 +1275,7 @@ class UserProfile(models.Model):
             )
             return True
         except MailChimpError as e:
-            if e[0]['status'] != 404: # don't log case where user is not on a list
+            if e.args[0]['status'] != 404: # don't log case where user is not on a list
                 logger.error("error getting mailchimp status  %s" % (e))
         except Exception as e:
             logger.error("error unsubscribing from mailchimp list  %s" % (e))
diff --git a/core/models/bibmodels.py b/core/models/bibmodels.py
index a121d913..7ee3be3f 100644
--- a/core/models/bibmodels.py
+++ b/core/models/bibmodels.py
@@ -404,9 +404,9 @@ class Work(models.Model):
                     status = 6
                 else:
                     if campaign.type == BUY2UNGLUE:
-                        status = int(6 - 6*campaign.left/campaign.target)
+                        status = int(6 - 6 * campaign.left / campaign.target)
                     else:
-                        status = int(float(campaign.current_total)*6/target)
+                        status = int(float(campaign.current_total) * 6 / target)
                     if status >= 6:
                         status = 6
         return status
diff --git a/frontend/views/__init__.py b/frontend/views/__init__.py
index 77913d6a..319d2dd8 100755
--- a/frontend/views/__init__.py
+++ b/frontend/views/__init__.py
@@ -1302,7 +1302,7 @@ class GiftCredit(TemplateView):
             return context
         except CreditLog.DoesNotExist:
             #not used yet!
-            amount = envelope['amount']+envelope['cents']/D(100)
+            amount = envelope['amount'] + envelope['cents'] // D(100)
             CreditLog.objects.create(user=user, amount=amount, action='deposit', sent=envelope['sent'])
             ts = Transaction.objects.filter(user=user, campaign=campaign, status=TRANSACTION_STATUS_NONE).order_by('-pk')
             if ts.count()==0:
@@ -2763,7 +2763,7 @@ class DownloadView(PurchaseView):
             'action': "Contribution",
             'user_license': self.user_license,
             'lib_thanked': self.lib_thanked,
-            'amount': D(self.request.session.pop('amount')/100) if 'amount' in self.request.session else None,
+            'amount': D(self.request.session.pop('amount') // 100) if 'amount' in self.request.session else None,
             'testmode': 'testmode' in self.request.GET or 'testmode' in self.request.POST,
             'source': self.request.GET.get('source', self.request.POST.get('source', '')),