diff --git a/create_debug_users.py b/create_debug_users.py
index c061cf76..98eb0ce4 100755
--- a/create_debug_users.py
+++ b/create_debug_users.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 import os
-import sys
 import subprocess
+import sys
 
 if not __file__.endswith("shell.py"):
     subprocess.call(
diff --git a/tin/apps/assignments/admin.py b/tin/apps/assignments/admin.py
index 63c1a5fc..c6fc480f 100644
--- a/tin/apps/assignments/admin.py
+++ b/tin/apps/assignments/admin.py
@@ -60,7 +60,14 @@ def end_time(self, obj):
 @admin.register(Quiz)
 class QuizAdmin(admin.ModelAdmin):
     date_hierarchy = "assignment__due"
-    list_display = ("assignment", "course_name", "folder_name", "due", "action", "visible")
+    list_display = (
+        "assignment",
+        "course_name",
+        "folder_name",
+        "due",
+        "action",
+        "visible",
+    )
     list_filter = ("action",)
     ordering = ("-assignment__due",)
     save_as = True
@@ -102,7 +109,14 @@ def assignment(self, obj):
 @admin.register(MossResult)
 class MossResultAdmin(admin.ModelAdmin):
     date_hierarchy = "date"
-    list_display = ("date", "assignment", "course_name", "language", "user_id", "status")
+    list_display = (
+        "date",
+        "assignment",
+        "course_name",
+        "language",
+        "user_id",
+        "status",
+    )
     list_filter = ("assignment__course", "language", "user_id")
     ordering = ("-date",)
     save_as = True
diff --git a/tin/apps/assignments/forms.py b/tin/apps/assignments/forms.py
index 665ea418..3bcf7e04 100644
--- a/tin/apps/assignments/forms.py
+++ b/tin/apps/assignments/forms.py
@@ -6,7 +6,12 @@
 
 
 class AssignmentForm(forms.ModelForm):
-    QUIZ_ACTIONS = (("-1", "No"), ("0", "Log only"), ("1", "Color Change"), ("2", "Lock"))
+    QUIZ_ACTIONS = (
+        ("-1", "No"),
+        ("0", "Log only"),
+        ("1", "Color Change"),
+        ("2", "Lock"),
+    )
 
     due = forms.DateTimeInput()
     is_quiz = forms.ChoiceField(choices=QUIZ_ACTIONS)
diff --git a/tin/apps/assignments/models.py b/tin/apps/assignments/models.py
index 1b51f041..b3ca2d04 100644
--- a/tin/apps/assignments/models.py
+++ b/tin/apps/assignments/models.py
@@ -391,7 +391,8 @@ def __repr__(self):
 
     def get_absolute_url(self):
         return reverse(
-            "assignments:student_submission", args=(self.quiz.assignment.id, self.student.id)
+            "assignments:student_submission",
+            args=(self.quiz.assignment.id, self.student.id),
         )
 
 
diff --git a/tin/apps/assignments/urls.py b/tin/apps/assignments/urls.py
index 6a7a3407..e818a017 100644
--- a/tin/apps/assignments/urls.py
+++ b/tin/apps/assignments/urls.py
@@ -10,7 +10,11 @@
     path("<int:assignment_id>/edit", views.edit_view, name="edit"),
     path("<int:assignment_id>/delete", views.delete_view, name="delete"),
     path("<int:assignment_id>/grader", views.manage_grader_view, name="manage_grader"),
-    path("<int:assignment_id>/grader/download", views.download_grader_view, name="download_grader"),
+    path(
+        "<int:assignment_id>/grader/download",
+        views.download_grader_view,
+        name="download_grader",
+    ),
     path("<int:assignment_id>/files", views.manage_files_view, name="manage_files"),
     path(
         "<int:assignment_id>/files/download/<int:file_id>",
@@ -46,9 +50,17 @@
     ),
     path("<int:assignment_id>/moss", views.moss_view, name="moss"),
     path("<int:assignment_id>/download_log", views.download_log_view, name="download_log"),
-    path("folder/<int:course_id>/<int:folder_id>", views.show_folder_view, name="show_folder"),
+    path(
+        "folder/<int:course_id>/<int:folder_id>",
+        views.show_folder_view,
+        name="show_folder",
+    ),
     path("add/folder/<int:course_id>", views.create_folder_view, name="add_folder"),
-    path("edit/folder/<int:course_id>/<int:folder_id>", views.edit_folder_view, name="edit_folder"),
+    path(
+        "edit/folder/<int:course_id>/<int:folder_id>",
+        views.edit_folder_view,
+        name="edit_folder",
+    ),
     path(
         "delete/folder/<int:course_id>/<int:folder_id>",
         views.delete_folder_view,
diff --git a/tin/apps/assignments/views.py b/tin/apps/assignments/views.py
index 9b24cb0e..d440465c 100644
--- a/tin/apps/assignments/views.py
+++ b/tin/apps/assignments/views.py
@@ -1,6 +1,5 @@
 import csv
 import datetime
-import json
 import logging
 import os
 import subprocess
@@ -729,7 +728,10 @@ def quiz_report_view(request, assignment_id):
 
     if not assignment.quiz.ended_for_student(request.user):
         LogMessage.objects.create(
-            quiz=assignment.quiz, student=request.user, content=content, severity=severity
+            quiz=assignment.quiz,
+            student=request.user,
+            content=content,
+            severity=severity,
         )
 
         if severity >= settings.QUIZ_ISSUE_THRESHOLD:
diff --git a/tin/apps/auth/oauth.py b/tin/apps/auth/oauth.py
index 43b31644..6cfecad8 100644
--- a/tin/apps/auth/oauth.py
+++ b/tin/apps/auth/oauth.py
@@ -21,7 +21,8 @@ def get_scope(self):
 
     def get_user_details(self, response):
         profile = self.get_json(
-            "https://ion.tjhsst.edu/api/profile", params={"access_token": response["access_token"]}
+            "https://ion.tjhsst.edu/api/profile",
+            params={"access_token": response["access_token"]},
         )
         # fields used to populate/update User model
         return {
diff --git a/tin/apps/courses/urls.py b/tin/apps/courses/urls.py
index 24dba788..656aae45 100644
--- a/tin/apps/courses/urls.py
+++ b/tin/apps/courses/urls.py
@@ -9,15 +9,31 @@
     path("<int:course_id>", views.show_view, name="show"),
     path("add/", views.create_view, name="create"),
     path("<int:course_id>/edit", views.edit_view, name="edit"),
-    path("<int:course_id>/import", views.import_select_course_view, name="import_select_course"),
+    path(
+        "<int:course_id>/import",
+        views.import_select_course_view,
+        name="import_select_course",
+    ),
     path(
         "<int:course_id>/import/<int:other_course_id>",
         views.import_from_selected_course,
         name="import_from_selected_course",
     ),
     path("<int:course_id>/students", views.students_view, name="students"),
-    path("<int:course_id>/students/import", views.import_students_view, name="import_students"),
-    path("<int:course_id>/students/manage", views.manage_students_view, name="manage_students"),
+    path(
+        "<int:course_id>/students/import",
+        views.import_students_view,
+        name="import_students",
+    ),
+    path(
+        "<int:course_id>/students/manage",
+        views.manage_students_view,
+        name="manage_students",
+    ),
     path("<int:course_id>/add_period", views.add_period_view, name="add_period"),
-    path("<int:course_id>/edit_period/<int:period_id>", views.edit_period_view, name="edit_period"),
+    path(
+        "<int:course_id>/edit_period/<int:period_id>",
+        views.edit_period_view,
+        name="edit_period",
+    ),
 ]
diff --git a/tin/apps/courses/views.py b/tin/apps/courses/views.py
index 452bfedd..e02845d7 100644
--- a/tin/apps/courses/views.py
+++ b/tin/apps/courses/views.py
@@ -101,7 +101,9 @@ def edit_view(request, course_id):
         form = CourseForm(instance=course)
 
     return render(
-        request, "courses/edit_create.html", {"form": form, "course": course, "nav_item": "Edit"}
+        request,
+        "courses/edit_create.html",
+        {"form": form, "course": course, "nav_item": "Edit"},
     )
 
 
diff --git a/tin/apps/docs/views.py b/tin/apps/docs/views.py
index fe909358..45031c96 100644
--- a/tin/apps/docs/views.py
+++ b/tin/apps/docs/views.py
@@ -28,5 +28,7 @@ def graders_view(request):
 @teacher_or_superuser_required
 def sample_graders_view(request):
     return render(
-        request, "docs/sample_graders.html", {"docs_app": True, "nav_item": "Sample graders"}
+        request,
+        "docs/sample_graders.html",
+        {"docs_app": True, "nav_item": "Sample graders"},
     )
diff --git a/tin/apps/submissions/forms.py b/tin/apps/submissions/forms.py
index f9af42ff..ae2e98f8 100644
--- a/tin/apps/submissions/forms.py
+++ b/tin/apps/submissions/forms.py
@@ -53,7 +53,9 @@ class FilterForm(forms.Form):
         label="Folders", queryset=Folder.objects.all().order_by("name"), required=False
     )
     assignments = CustomModelMultipleChoiceField(
-        label="Assignments", queryset=Assignment.objects.all().order_by("name"), required=False
+        label="Assignments",
+        queryset=Assignment.objects.all().order_by("name"),
+        required=False,
     )
     periods = CustomModelMultipleChoiceField(
         label="Periods", queryset=Period.objects.all().order_by("name"), required=False
diff --git a/tin/apps/submissions/models.py b/tin/apps/submissions/models.py
index 762993cc..6e376116 100644
--- a/tin/apps/submissions/models.py
+++ b/tin/apps/submissions/models.py
@@ -336,7 +336,9 @@ class PublishedSubmission(models.Model):
     date = models.DateTimeField(auto_now_add=True)
 
     assignment = models.ForeignKey(
-        "assignments.Assignment", on_delete=models.CASCADE, related_name="final_submissions"
+        "assignments.Assignment",
+        on_delete=models.CASCADE,
+        related_name="final_submissions",
     )
     student = models.ForeignKey(
         get_user_model(), on_delete=models.CASCADE, related_name="final_submissions"
diff --git a/tin/apps/submissions/tasks.py b/tin/apps/submissions/tasks.py
index b24a5795..f8f1f1af 100644
--- a/tin/apps/submissions/tasks.py
+++ b/tin/apps/submissions/tasks.py
@@ -131,7 +131,11 @@ def run_submission(submission_id):
 
         if not settings.DEBUG or shutil.which("firejail") is not None:
             whitelist = [os.path.dirname(grader_path)]
-            read_only = [grader_path, submission_path, os.path.dirname(submission_wrapper_path)]
+            read_only = [
+                grader_path,
+                submission_path,
+                os.path.dirname(submission_wrapper_path),
+            ]
             if submission.assignment.venv_fully_created:
                 whitelist.append(submission.assignment.venv.path)
                 read_only.append(submission.assignment.venv.path)
diff --git a/tin/apps/submissions/urls.py b/tin/apps/submissions/urls.py
index 17651e76..79687f78 100644
--- a/tin/apps/submissions/urls.py
+++ b/tin/apps/submissions/urls.py
@@ -24,7 +24,11 @@
     path("<int:submission_id>/publish", views.publish_view, name="publish"),
     path("<int:submission_id>/unpublish", views.unpublish_view, name="unpublish"),
     path("filter", views.filter_view, name="filter"),
-    path("set-aborted-complete", views.set_aborted_complete_view, name="set_aborted_complete"),
+    path(
+        "set-aborted-complete",
+        views.set_aborted_complete_view,
+        name="set_aborted_complete",
+    ),
     path(
         "set-past-timeout-complete",
         views.set_past_timeout_complete_view,
diff --git a/tin/apps/submissions/views.py b/tin/apps/submissions/views.py
index c475847e..f343715c 100644
--- a/tin/apps/submissions/views.py
+++ b/tin/apps/submissions/views.py
@@ -142,7 +142,9 @@ def edit_comment_view(request, submission_id, comment_id):
             return redirect("submissions:show", submission.id)
 
     before_submissions = Submission.objects.filter(
-        student=submission.student, assignment=submission.assignment, id__lt=submission.id
+        student=submission.student,
+        assignment=submission.assignment,
+        id__lt=submission.id,
     )
     submission_number = before_submissions.count() + 1
 
diff --git a/tin/apps/venvs/models.py b/tin/apps/venvs/models.py
index 49190aea..71f8dbf7 100644
--- a/tin/apps/venvs/models.py
+++ b/tin/apps/venvs/models.py
@@ -1,10 +1,9 @@
 import logging
 import os
 import subprocess
-import sys
 
 from django.conf import settings
-from django.db import IntegrityError, models
+from django.db import models
 from django.urls import reverse
 
 from ... import sandboxing
diff --git a/tin/apps/venvs/tasks.py b/tin/apps/venvs/tasks.py
index 39ac833c..8dd5f708 100644
--- a/tin/apps/venvs/tasks.py
+++ b/tin/apps/venvs/tasks.py
@@ -6,7 +6,7 @@
 
 from django.conf import settings
 
-from .models import Venv, VenvCreationError, VenvExistsError
+from .models import Venv, VenvCreationError
 
 logger = logging.getLogger(__name__)
 
diff --git a/tin/apps/venvs/urls.py b/tin/apps/venvs/urls.py
index 7ee081dc..5e6edf7d 100644
--- a/tin/apps/venvs/urls.py
+++ b/tin/apps/venvs/urls.py
@@ -8,5 +8,9 @@
     path("", views.index_view, name="index"),
     path("<int:venv_id>", views.show_view, name="show"),
     path("add", views.create_view, name="add"),
-    path("<int:venv_id>/install_packages", views.install_packages_view, name="install_packages"),
+    path(
+        "<int:venv_id>/install_packages",
+        views.install_packages_view,
+        name="install_packages",
+    ),
 ]
diff --git a/tin/apps/venvs/views.py b/tin/apps/venvs/views.py
index 5bfdaf8a..4ca7d088 100644
--- a/tin/apps/venvs/views.py
+++ b/tin/apps/venvs/views.py
@@ -1,7 +1,6 @@
 from django import http
 from django.shortcuts import get_object_or_404, redirect, render
 
-from ..assignments.models import Assignment
 from ..auth.decorators import teacher_or_superuser_required
 from .forms import VenvForm
 from .models import Venv
@@ -89,7 +88,9 @@ def edit_view(request, venv_id):
 def install_packages_view(request, venv_id):
     if request.method == "POST":
         venv = get_object_or_404(
-            Venv.objects.filter_editable(request.user), id=venv_id, installing_packages=False
+            Venv.objects.filter_editable(request.user),
+            id=venv_id,
+            installing_packages=False,
         )
 
         venv.installing_packages = True
diff --git a/tin/templates/venvs/show.html b/tin/templates/venvs/show.html
index 8f2f13b2..ac8c1b3f 100644
--- a/tin/templates/venvs/show.html
+++ b/tin/templates/venvs/show.html
@@ -20,7 +20,7 @@ <h2 class="left">{{ venv.name }}</h2>
     <p>If it takes more than a few minutes, please contact the Tin maintainers by emailing <a href="mailto:{{ DEVELOPER_EMAIL }}">{{ DEVELOPER_EMAIL }}</a>
   {% else %}
     <h3>Installed packages</h3>
-  
+
     {% if venv.installing_packages %}
       <p class="italic">This virtual environment is currently installing or upgrading packages. This list may be
         incomplete.</p>
@@ -49,7 +49,7 @@ <h3>Installed packages</h3>
         {% endif %}
       {% endwith %}
     </table>
-  
+
     <h3>Install packages</h3>
     {% if venv.installing_packages %}
       <p class="italic">
@@ -72,7 +72,7 @@ <h3>Install packages</h3>
         <input type="submit" value="Install packages"{% if venv.installing_packages %} disabled{% endif %}>
       </form>
     {% endif %}
-  
+
     {% if venv.package_installation_output and not venv.installing_packages %}
       <h3>Last package installation output</h3>
       <pre><code class="nohljsln">{{ venv.package_installation_output }}</code></pre>