Fix mypy errors

Author: RadoRado

styleguide_example/users/apis.py

@@ -1,4 +1,4 @@
-from django.shortcuts import Http404
+from django.http import Http404
 from rest_framework import serializers
 from rest_framework.response import Response
 from rest_framework.views import APIView

styleguide_example/users/services.py

@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, List
 
 from django.db import transaction
 
@@ -17,7 +17,7 @@ def user_create(
 
 @transaction.atomic
 def user_update(*, user: BaseUser, data) -> BaseUser:
-    non_side_effect_fields = [
+    non_side_effect_fields: List[str] = [
         # "first_name",
         # "last_name"
     ]