Improved error message when index in __getitem__() is invalid.

3 files changed, 12 insertions, 3 deletions

diff --git a/django/core/paginator.py b/django/core/paginator.py
index d484c31ed5..73dfcd679f 100644
--- a/django/core/paginator.py
+++ b/django/core/paginator.py
@@ -151,7 +151,10 @@ class Page(collections.abc.Sequence):
 
     def __getitem__(self, index):
         if not isinstance(index, (int, slice)):
-            raise TypeError
+            raise TypeError(
+                'Page indices must be integers or slices, not %s.'
+                % type(index).__name__
+            )
         # The object_list is converted to a list so that if it was a QuerySet
         # it won't be a database hit per __getitem__.
         if not isinstance(self.object_list, list):
diff --git a/django/db/models/query.py b/django/db/models/query.py
index 1544beb613..a62947d9d0 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -283,7 +283,10 @@ class QuerySet:
     def __getitem__(self, k):
         """Retrieve an item or slice from the set of results."""
         if not isinstance(k, (int, slice)):
-            raise TypeError
+            raise TypeError(
+                'QuerySet indices must be integers or slices, not %s.'
+                % type(k).__name__
+            )
         assert ((not isinstance(k, slice) and (k >= 0)) or
                 (isinstance(k, slice) and (k.start is None or k.start >= 0) and
                  (k.stop is None or k.stop >= 0))), \
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