From 4302167939767e713388c49d8af3cefe27695629 Mon Sep 17 00:00:00 2001
From: Sergey Fedoseev <fedoseev.sergey@gmail.com>
Date: Wed, 23 Aug 2017 20:47:47 +0500
Subject: [PATCH] Used frozenset instead of dict for GeoIP2.cache_options for
 simplicity.

---
 django/contrib/gis/geoip2/base.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/django/contrib/gis/geoip2/base.py b/django/contrib/gis/geoip2/base.py
index 40b45fd72b..b1035ac6ff 100644
--- a/django/contrib/gis/geoip2/base.py
+++ b/django/contrib/gis/geoip2/base.py
@@ -33,7 +33,7 @@ class GeoIP2:
     MODE_FILE = 4
     # Load database into memory. Pure Python.
     MODE_MEMORY = 8
-    cache_options = {opt: None for opt in (0, 1, 2, 4, 8)}
+    cache_options = frozenset((MODE_AUTO, MODE_MMAP_EXT, MODE_MMAP, MODE_FILE, MODE_MEMORY))
 
     # Paths to the city & country binary databases.
     _city_file = ''