Code style improvements (#4683)

* fix list comps

* mopre comp fixes

* reduce computing cost on any() calls

* add bugbear

* check for clean imports

* only allow limited relative imports

* fix notification method lookup

* fix notification method assigement

* rewrite assigment

* fix upstream changes to new style

* fix upstream change to new coding style

InvenTree/part/admin.py

@@ -3,13 +3,13 @@
 from django.contrib import admin
 from django.utils.translation import gettext_lazy as _
 
-import import_export.widgets as widgets
+from import_export import widgets
 from import_export.admin import ImportExportModelAdmin
 from import_export.fields import Field
 
-import part.models as models
 from company.models import SupplierPart
 from InvenTree.admin import InvenTreeResource
+from part import models
 from stock.models import StockLocation