Used more augmented assignment statements.

Identified using the following command:

$ git grep -I '\(\<[_a-zA-Z0-9]\+\>\) *= *\1 *[-+/*^%&|<>@]'

3 files changed, 5 insertions, 5 deletions

diff --git a/django/contrib/admin/helpers.py b/django/contrib/admin/helpers.py
index 27b35f6ce8..b038b3ebbb 100644
--- a/django/contrib/admin/helpers.py
+++ b/django/contrib/admin/helpers.py
@@ -95,7 +95,7 @@ class AdminForm:
     def media(self):
         media = self.form.media
         for fs in self:
-            media = media + fs.media
+            media += fs.media
         return media
 
 
@@ -456,7 +456,7 @@ class InlineAdminFormSet:
     def media(self):
         media = self.opts.media + self.formset.media
         for fs in self:
-            media = media + fs.media
+            media += fs.media
         return media
 
 
diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 215df9a059..e6d4ae12bb 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -1840,7 +1840,7 @@ class ModelAdmin(BaseModelAdmin):
             request, formsets, inline_instances, obj
         )
         for inline_formset in inline_formsets:
-            media = media + inline_formset.media
+            media += inline_formset.media
 
         if add:
             title = _("Add %s")
diff --git a/django/contrib/admin/static/admin/js/core.js b/django/contrib/admin/static/admin/js/core.js
index afdae281c3..0344a13f42 100644
--- a/django/contrib/admin/static/admin/js/core.js
+++ b/django/contrib/admin/static/admin/js/core.js
@@ -119,11 +119,11 @@ function findPosY(obj) {
         let result = '', i = 0;
         while (i < format.length) {
             if (format.charAt(i) === '%') {
-                result = result + fields[format.charAt(i + 1)];
+                result += fields[format.charAt(i + 1)];
                 ++i;
             }
             else {
-                result = result + format.charAt(i);
+                result += format.charAt(i);
             }
             ++i;
         }