sort imports using isort. tested.

core/views/expo.py

@@ -1,28 +1,26 @@
 import os
 import re
-
-from sys import getfilesystemencoding as sys_getfilesystemencoding
-
 from pathlib import Path
-from urllib.parse import urljoin, unquote as urlunquote
+from sys import getfilesystemencoding as sys_getfilesystemencoding
+from urllib.parse import unquote as urlunquote
+from urllib.parse import urljoin
 from urllib.request import urlopen
 
-from django.shortcuts import render, redirect
-from django.http import HttpResponse, HttpResponseRedirect, Http404
-from django.urls import reverse, resolve
-from django.template import Context, loader
-from django.views.decorators.csrf import ensure_csrf_cookie
-from django.contrib import admin
-
 import django.forms as forms
+from django.contrib import admin
+from django.http import Http404, HttpResponse, HttpResponseRedirect
+from django.shortcuts import redirect, render
+from django.template import Context, loader
+from django.urls import resolve, reverse
+from django.views.decorators.csrf import ensure_csrf_cookie
 
 import troggle.core.views.caves
 import troggle.settings as settings
-from .auth import login_required_if_public
 from troggle.core.models.caves import Cave
-from troggle.core.utils import write_and_commit, WriteAndCommitError
+from troggle.core.utils import WriteAndCommitError, write_and_commit
 from troggle.core.views.editor_helpers import HTMLarea
 
+from .auth import login_required_if_public
 
 '''Formerly a separate package called 'flatpages' written by Martin Green 2011. 
 This was NOT django.contrib.flatpages which stores HTML in the database, so the name was changed to expopages.