fix linting errors

src/registrar/views/application.py

@@ -6,7 +6,6 @@ from django.shortcuts import redirect, render
 from django.urls import resolve, reverse
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import TemplateView
-from django.views import generic
 from django.contrib import messages
 
 from registrar.forms import application_wizard as forms
@@ -494,13 +493,13 @@ class ApplicationWithdrawConfirmation(DomainApplicationPermissionView):
 
 class ApplicationWithdrawn(DomainApplicationPermissionView):
     # this view renders no template
-    template_name = None
+    template_name = ""
 
     def get(self, *args, **kwargs):
         """View class that does the actual withdrawing.
 
-        If user click on withdraw confirm button, this view updates the status to withdraw
-        and send back to homepage.
+        If user click on withdraw confirm button, this view updates the status
+        to withdraw and send back to homepage.
         """
         application = DomainApplication.objects.get(id=self.kwargs["pk"])
         application.status = "withdrawn"

src/registrar/views/domain.py

@@ -12,10 +12,9 @@ from django.contrib.messages.views import SuccessMessageMixin
 from django.db import IntegrityError
 from django.shortcuts import redirect
 from django.urls import reverse
-from django.views.generic import DetailView
-from django.views.generic.edit import DeleteView, FormMixin
+from django.views.generic.edit import FormMixin
 
-from registrar.models import Domain, DomainInvitation, User, UserDomainRole
+from registrar.models import DomainInvitation, User, UserDomainRole
 
 from ..forms import DomainAddUserForm, NameserverFormset, DomainSecurityEmailForm
 from ..utility.email import send_templated_email, EmailSendingError
@@ -235,7 +234,11 @@ class DomainAddUserView(DomainPermissionView, FormMixin):
         return redirect(self.get_success_url())
 
 
-class DomainInvitationDeleteView(DomainInvitationPermissionDeleteView):
+class DomainInvitationDeleteView(
+    DomainInvitationPermissionDeleteView, SuccessMessageMixin
+):
+    object: DomainInvitation  # workaround for type mismatch in DeleteView
+
     def get_success_url(self):
         return reverse("domain-users", kwargs={"pk": self.object.domain.id})
 

src/registrar/views/utility/permission_views.py

@@ -17,7 +17,8 @@ class DomainPermissionView(DomainPermission, DetailView, abc.ABC):
 
     """Abstract base view for domains that enforces permissions.
 
-    This abstract view cannot be instantiated. Actual views must specify `template_name`.
+    This abstract view cannot be instantiated. Actual views must specify
+    `template_name`.
     """
 
     # DetailView property for what model this is viewing
@@ -36,7 +37,8 @@ class DomainApplicationPermissionView(DomainApplicationPermission, DetailView, a
 
     """Abstract base view for domain applications that enforces permissions
 
-    This abstract view cannot be instantiated. Actual views must specify `template_name`.
+    This abstract view cannot be instantiated. Actual views must specify
+    `template_name`.
     """
 
     # DetailView property for what model this is viewing