From d89053585e11e869efcc9debb1c311b47b5e20ea Mon Sep 17 00:00:00 2001
From: Jon Dufresne <jon.dufresne@gmail.com>
Date: Fri, 19 Jul 2019 13:55:32 -0700
Subject: Improved error message when index in __getitem__() is invalid.

---
 django/forms/boundfield.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'django/forms')

diff --git a/django/forms/boundfield.py b/django/forms/boundfield.py
index 7f40fbbbb4..8832169021 100644
--- a/django/forms/boundfield.py
+++ b/django/forms/boundfield.py
@@ -63,7 +63,10 @@ class BoundField:
         # Prevent unnecessary reevaluation when accessing BoundField's attrs
         # from templates.
         if not isinstance(idx, (int, slice)):
-            raise TypeError
+            raise TypeError(
+                'BoundField indices must be integers or slices, not %s.'
+                % type(idx).__name__
+            )
         return self.subwidgets[idx]
 
     @property
-- 
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