Fix issues reported by pylama.

biscuit/core/tables.py

-from django.utils.translation import ugettext_lazy as _
 import django_tables2 as tables
 from django_tables2.utils import A
 

biscuit/core/urls.py

 from django.apps import apps
 from django.conf import settings
 from django.conf.urls.static import static
-from django.contrib import admin
 from django.urls import include, path
 
 import debug_toolbar

biscuit/core/util/core_helpers.py

@@ -26,7 +26,7 @@ def get_app_packages() -> Sequence[str]:
         # Add additional apps defined in module's INSTALLED_APPS constant
         additional_apps = getattr(mod, 'INSTALLED_APPS', [])
         for app in additional_apps:
-            if not app in pkgs:
+            if app not in pkgs:
                 pkgs.append(app)
 
         pkgs.append('biscuit.apps.%s' % pkg[1])

biscuit/core/views.py

 from typing import Callable
 
 from django.contrib.auth.decorators import login_required
-from django.conf import settings
 from django.http import Http404, HttpRequest, HttpResponse
 from django.shortcuts import get_object_or_404, render, redirect
 from django_tables2 import RequestConfig

dev.sh

@@ -36,7 +36,13 @@ case "$1" in
         	poetry run sh -c "cd $d; autopep8 -i -r ."
         done
         ;;
-
+    "pylama")
+        cd "$(dirname "$0")"
+        for d in biscuit/core apps/official/*/biscuit/apps/*; do
+        	echo; echo "Entering $d."
+        	poetry run sh -c "cd $d; pylama ."
+        done
+        ;;
     *)
 	;;
 esac