diff --git a/InvenTree/InvenTree/helpers.py b/InvenTree/InvenTree/helpers.py
index 3032b328bd..6dad393349 100644
--- a/InvenTree/InvenTree/helpers.py
+++ b/InvenTree/InvenTree/helpers.py
@@ -315,7 +315,7 @@ def WrapWithQuotes(text, quote='"'):
     return text
 
 
-def MakeBarcode(object_name, object_pk, object_data={}, **kwargs):
+def MakeBarcode(object_name, object_pk, object_data=None, **kwargs):
     """ Generate a string for a barcode. Adds some global InvenTree parameters.
 
     Args:
@@ -327,6 +327,8 @@ def MakeBarcode(object_name, object_pk, object_data={}, **kwargs):
     Returns:
         json string of the supplied data plus some other data
     """
+    if object_data is None:
+        object_data = {}
 
     url = kwargs.get('url', False)
     brief = kwargs.get('brief', True)
diff --git a/InvenTree/barcodes/api.py b/InvenTree/barcodes/api.py
index 355fcab0e1..0d3656ce4c 100644
--- a/InvenTree/barcodes/api.py
+++ b/InvenTree/barcodes/api.py
@@ -109,14 +109,14 @@ class BarcodeScan(APIView):
         # No plugin is found!
         # However, the hash of the barcode may still be associated with a StockItem!
         else:
-            hash = hash_barcode(barcode_data)
+            result_hash = hash_barcode(barcode_data)
 
-            response['hash'] = hash
+            response['hash'] = result_hash
             response['plugin'] = None
 
             # Try to look for a matching StockItem
             try:
-                item = StockItem.objects.get(uid=hash)
+                item = StockItem.objects.get(uid=result_hash)
                 serializer = StockItemSerializer(item, part_detail=True, location_detail=True, supplier_part_detail=True)
                 response['stockitem'] = serializer.data
                 response['url'] = reverse('stock-item-detail', kwargs={'pk': item.id})
@@ -182,8 +182,8 @@ class BarcodeAssign(APIView):
         # Matching plugin was found
         if plugin is not None:
 
-            hash = plugin.hash()
-            response['hash'] = hash
+            result_hash = plugin.hash()
+            response['hash'] = result_hash
             response['plugin'] = plugin.name
 
             # Ensure that the barcode does not already match a database entry
@@ -208,14 +208,14 @@ class BarcodeAssign(APIView):
                     match_found = True
 
         else:
-            hash = hash_barcode(barcode_data)
+            result_hash = hash_barcode(barcode_data)
 
-            response['hash'] = hash
+            response['hash'] = result_hash
             response['plugin'] = None
 
             # Lookup stock item by hash
             try:
-                item = StockItem.objects.get(uid=hash)
+                item = StockItem.objects.get(uid=result_hash)
                 response['error'] = _('Barcode hash already matches Stock Item')
                 match_found = True
             except StockItem.DoesNotExist:
diff --git a/InvenTree/barcodes/tests.py b/InvenTree/barcodes/tests.py
index 1d8f53ec4c..a9795c3928 100644
--- a/InvenTree/barcodes/tests.py
+++ b/InvenTree/barcodes/tests.py
@@ -124,12 +124,12 @@ class BarcodeAPITest(APITestCase):
 
         self.assertIn('success', data)
 
-        hash = data['hash']
+        result_hash = data['hash']
 
         # Read the item out from the database again
         item = StockItem.objects.get(pk=522)
 
-        self.assertEqual(hash, item.uid)
+        self.assertEqual(result_hash, item.uid)
 
         # Ensure that the same UID cannot be assigned to a different stock item!
         response = self.client.post(
diff --git a/InvenTree/build/test_api.py b/InvenTree/build/test_api.py
index 1e0c2b4792..9c20dea580 100644
--- a/InvenTree/build/test_api.py
+++ b/InvenTree/build/test_api.py
@@ -193,7 +193,7 @@ class BuildOutputCompleteTest(BuildAPITest):
         self.assertTrue('accept_unallocated' in response.data)
 
         # Accept unallocated stock
-        response = self.post(
+        self.post(
             finish_url,
             {
                 'accept_unallocated': True,
diff --git a/InvenTree/common/api.py b/InvenTree/common/api.py
index 65cdea90c5..7c246c46d5 100644
--- a/InvenTree/common/api.py
+++ b/InvenTree/common/api.py
@@ -66,7 +66,6 @@ class WebhookView(CsrfExemptMixin, APIView):
                 message,
             )
 
-        # return results
         data = self.webhook.get_return(payload, headers, request)
         return HttpResponse(data)
 
diff --git a/InvenTree/common/files.py b/InvenTree/common/files.py
index 39c97dca6c..e58b977f2c 100644
--- a/InvenTree/common/files.py
+++ b/InvenTree/common/files.py
@@ -9,8 +9,6 @@ import os
 from django.utils.translation import gettext_lazy as _
 from django.core.exceptions import ValidationError
 
-# from company.models import ManufacturerPart, SupplierPart
-
 
 class FileManager:
     """ Class for managing an uploaded file """
diff --git a/InvenTree/common/models.py b/InvenTree/common/models.py
index e60de3a33f..261f6edaff 100644
--- a/InvenTree/common/models.py
+++ b/InvenTree/common/models.py
@@ -1475,11 +1475,9 @@ class WebhookEndpoint(models.Model):
 
     def process_webhook(self):
         if self.token:
-            self.token = self.token
             self.verify = VerificationMethod.TOKEN
             # TODO make a object-setting
         if self.secret:
-            self.secret = self.secret
             self.verify = VerificationMethod.HMAC
             # TODO make a object-setting
         return True
@@ -1489,6 +1487,7 @@ class WebhookEndpoint(models.Model):
 
         # no token
         if self.verify == VerificationMethod.NONE:
+            # do nothing as no method was chosen
             pass
 
         # static token
diff --git a/InvenTree/common/tests.py b/InvenTree/common/tests.py
index a02793fb12..c82ca41f38 100644
--- a/InvenTree/common/tests.py
+++ b/InvenTree/common/tests.py
@@ -10,6 +10,8 @@ from django.contrib.auth import get_user_model
 from .models import InvenTreeSetting, WebhookEndpoint, WebhookMessage, NotificationEntry
 from .api import WebhookView
 
+CONTENT_TYPE_JSON = 'application/json'
+
 
 class SettingsTest(TestCase):
     """
@@ -105,7 +107,7 @@ class WebhookMessageTests(TestCase):
     def test_missing_token(self):
         response = self.client.post(
             self.url,
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
         )
 
         assert response.status_code == HTTPStatus.FORBIDDEN
@@ -116,7 +118,7 @@ class WebhookMessageTests(TestCase):
     def test_bad_token(self):
         response = self.client.post(
             self.url,
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
             **{'HTTP_TOKEN': '1234567fghj'},
         )
 
@@ -126,7 +128,7 @@ class WebhookMessageTests(TestCase):
     def test_bad_url(self):
         response = self.client.post(
             '/api/webhook/1234/',
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
         )
 
         assert response.status_code == HTTPStatus.NOT_FOUND
@@ -135,7 +137,7 @@ class WebhookMessageTests(TestCase):
         response = self.client.post(
             self.url,
             data="{'this': 123}",
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
             **{'HTTP_TOKEN': str(self.endpoint_def.token)},
         )
 
@@ -152,7 +154,7 @@ class WebhookMessageTests(TestCase):
         # check
         response = self.client.post(
             self.url,
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
         )
 
         assert response.status_code == HTTPStatus.OK
@@ -167,7 +169,7 @@ class WebhookMessageTests(TestCase):
         # check
         response = self.client.post(
             self.url,
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
         )
 
         assert response.status_code == HTTPStatus.FORBIDDEN
@@ -182,7 +184,7 @@ class WebhookMessageTests(TestCase):
         # check
         response = self.client.post(
             self.url,
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
             **{'HTTP_TOKEN': str('68MXtc/OiXdA5e2Nq9hATEVrZFpLb3Zb0oau7n8s31I=')},
         )
 
@@ -193,7 +195,7 @@ class WebhookMessageTests(TestCase):
         response = self.client.post(
             self.url,
             data={"this": "is a message"},
-            content_type='application/json',
+            content_type=CONTENT_TYPE_JSON,
             **{'HTTP_TOKEN': str(self.endpoint_def.token)},
         )
 
diff --git a/InvenTree/order/forms.py b/InvenTree/order/forms.py
index 3eb5566a1e..33044d8440 100644
--- a/InvenTree/order/forms.py
+++ b/InvenTree/order/forms.py
@@ -92,5 +92,4 @@ class OrderMatchItemForm(MatchItemForm):
                 default_amount=clean_decimal(row.get('purchase_price', '')),
             )
 
-        # return default
         return super().get_special_field(col_guess, row, file_manager)
diff --git a/InvenTree/part/api.py b/InvenTree/part/api.py
index 0625a717a5..d146c3d7b3 100644
--- a/InvenTree/part/api.py
+++ b/InvenTree/part/api.py
@@ -446,10 +446,10 @@ class PartSerialNumberDetail(generics.RetrieveAPIView):
         }
 
         if latest is not None:
-            next = increment(latest)
+            next_serial = increment(latest)
 
-            if next != increment:
-                data['next'] = next
+            if next_serial != increment:
+                data['next'] = next_serial
 
         return Response(data)
 
diff --git a/InvenTree/part/forms.py b/InvenTree/part/forms.py
index c4c7d29228..8925c6d9bd 100644
--- a/InvenTree/part/forms.py
+++ b/InvenTree/part/forms.py
@@ -75,7 +75,6 @@ class BomMatchItemForm(MatchItemForm):
                 })
             )
 
-        # return default
         return super().get_special_field(col_guess, row, file_manager)
 
 
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index fde9c80720..d186a9b5e7 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -1530,15 +1530,15 @@ class Part(MPTTModel):
         returns a string representation of a hash object which can be compared with a stored value
         """
 
-        hash = hashlib.md5(str(self.id).encode())
+        result_hash = hashlib.md5(str(self.id).encode())
 
         # List *all* BOM items (including inherited ones!)
         bom_items = self.get_bom_items().all().prefetch_related('sub_part')
 
         for item in bom_items:
-            hash.update(str(item.get_item_hash()).encode())
+            result_hash.update(str(item.get_item_hash()).encode())
 
-        return str(hash.digest())
+        return str(result_hash.digest())
 
     def is_bom_valid(self):
         """ Check if the BOM is 'valid' - if the calculated checksum matches the stored value
@@ -2188,9 +2188,7 @@ def after_save_part(sender, instance: Part, created, **kwargs):
     Function to be executed after a Part is saved
     """
 
-    if created:
-        pass
-    else:
+    if not created:
         # Check part stock only if we are *updating* the part (not creating it)
 
         # Run this check in the background
@@ -2678,18 +2676,18 @@ class BomItem(models.Model):
         """
 
         # Seed the hash with the ID of this BOM item
-        hash = hashlib.md5(str(self.id).encode())
+        result_hash = hashlib.md5(str(self.id).encode())
 
         # Update the hash based on line information
-        hash.update(str(self.sub_part.id).encode())
-        hash.update(str(self.sub_part.full_name).encode())
-        hash.update(str(self.quantity).encode())
-        hash.update(str(self.note).encode())
-        hash.update(str(self.reference).encode())
-        hash.update(str(self.optional).encode())
-        hash.update(str(self.inherited).encode())
+        result_hash.update(str(self.sub_part.id).encode())
+        result_hash.update(str(self.sub_part.full_name).encode())
+        result_hash.update(str(self.quantity).encode())
+        result_hash.update(str(self.note).encode())
+        result_hash.update(str(self.reference).encode())
+        result_hash.update(str(self.optional).encode())
+        result_hash.update(str(self.inherited).encode())
 
-        return str(hash.digest())
+        return str(result_hash.digest())
 
     def validate_hash(self, valid=True):
         """ Mark this item as 'valid' (store the checksum hash).
diff --git a/InvenTree/part/templatetags/inventree_extras.py b/InvenTree/part/templatetags/inventree_extras.py
index 64b8b8536f..627b925e23 100644
--- a/InvenTree/part/templatetags/inventree_extras.py
+++ b/InvenTree/part/templatetags/inventree_extras.py
@@ -293,7 +293,7 @@ def progress_bar(val, max, *args, **kwargs):
     Render a progress bar element
     """
 
-    id = kwargs.get('id', 'progress-bar')
+    item_id = kwargs.get('id', 'progress-bar')
 
     if val > max:
         style = 'progress-bar-over'
@@ -317,7 +317,7 @@ def progress_bar(val, max, *args, **kwargs):
         style_tags.append(f'max-width: {max_width};')
 
     html = f"""
-    <div id='{id}' class='progress' style='{" ".join(style_tags)}'>
+    <div id='{item_id}' class='progress' style='{" ".join(style_tags)}'>
         <div class='progress-bar {style}' role='progressbar' aria-valuemin='0' aria-valuemax='100' style='width:{percent}%'></div>
         <div class='progress-value'>{val} / {max}</div>
     </div>
diff --git a/InvenTree/part/test_part.py b/InvenTree/part/test_part.py
index 6397b9162f..7c9eec983c 100644
--- a/InvenTree/part/test_part.py
+++ b/InvenTree/part/test_part.py
@@ -30,8 +30,8 @@ class TemplateTagTest(TestCase):
         self.assertEqual(type(inventree_extras.inventree_version()), str)
 
     def test_hash(self):
-        hash = inventree_extras.inventree_commit_hash()
-        self.assertGreater(len(hash), 5)
+        result_hash = inventree_extras.inventree_commit_hash()
+        self.assertGreater(len(result_hash), 5)
 
     def test_date(self):
         d = inventree_extras.inventree_commit_date()
diff --git a/InvenTree/part/test_supplier_part.py b/InvenTree/part/test_supplier_part.py
deleted file mode 100644
index c34b788257..0000000000
--- a/InvenTree/part/test_supplier_part.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from django.test import TestCase
-
-
-class SupplierPartTest(TestCase):
-
-    def setUp(self):
-        pass
diff --git a/InvenTree/plugin/builtin/barcode/mixins.py b/InvenTree/plugin/builtin/barcode/mixins.py
index b86130f71e..693df4b662 100644
--- a/InvenTree/plugin/builtin/barcode/mixins.py
+++ b/InvenTree/plugin/builtin/barcode/mixins.py
@@ -25,8 +25,8 @@ def hash_barcode(barcode_data):
 
     barcode_data = ''.join(list(printable_chars))
 
-    hash = hashlib.md5(str(barcode_data).encode())
-    return str(hash.hexdigest())
+    result_hash = hashlib.md5(str(barcode_data).encode())
+    return str(result_hash.hexdigest())
 
 
 class BarcodeMixin:
diff --git a/InvenTree/plugin/integration.py b/InvenTree/plugin/integration.py
index 33afae852c..ccf1f6d2eb 100644
--- a/InvenTree/plugin/integration.py
+++ b/InvenTree/plugin/integration.py
@@ -173,8 +173,8 @@ class IntegrationPluginBase(MixinBase, plugin_base.InvenTreePluginBase):
         """
         License of plugin
         """
-        license = getattr(self, 'LICENSE', None)
-        return license
+        lic = getattr(self, 'LICENSE', None)
+        return lic
     # endregion
 
     @property
diff --git a/InvenTree/plugin/models.py b/InvenTree/plugin/models.py
index d6fd71d7c4..e33d452e0a 100644
--- a/InvenTree/plugin/models.py
+++ b/InvenTree/plugin/models.py
@@ -94,10 +94,8 @@ class PluginConfig(models.Model):
         ret = super().save(force_insert, force_update, *args, **kwargs)
 
         if not reload:
-            if self.active is False and self.__org_active is True:
-                registry.reload_plugins()
-
-            elif self.active is True and self.__org_active is False:
+            if (self.active is False and self.__org_active is True) or \
+               (self.active is True and self.__org_active is False):
                 registry.reload_plugins()
 
         return ret
diff --git a/InvenTree/plugin/registry.py b/InvenTree/plugin/registry.py
index 4b7f12bc6c..2cd8311e0f 100644
--- a/InvenTree/plugin/registry.py
+++ b/InvenTree/plugin/registry.py
@@ -390,6 +390,10 @@ class PluginsRegistry:
             logger.warning("activate_integration_schedule failed, database not ready")
 
     def deactivate_integration_schedule(self):
+        """
+        Deactivate ScheduleMixin
+        currently nothing is done
+        """
         pass
 
     def activate_integration_app(self, plugins, force_reload=False):
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index 140bd9c8e3..8a68eb5940 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -1022,7 +1022,7 @@ class StockItem(MPTTModel):
     def has_tracking_info(self):
         return self.tracking_info_count > 0
 
-    def add_tracking_entry(self, entry_type, user, deltas={}, notes='', **kwargs):
+    def add_tracking_entry(self, entry_type, user, deltas=None, notes='', **kwargs):
         """
         Add a history tracking entry for this StockItem
 
@@ -1033,6 +1033,8 @@ class StockItem(MPTTModel):
             notes - User notes associated with this tracking entry
             url - Optional URL associated with this tracking entry
         """
+        if deltas is None:
+            deltas = {}
 
         # Has a location been specified?
         location = kwargs.get('location', None)