commit 6a650aaf7735e30636db2721247f317064c2cfd4
author Sergey Fedoseev <fedoseev.sergey@gmail.com> Fri Aug 30 09:25:48 2019 +0500
committer Raymond Hettinger <rhettinger@users.noreply.github.com> Thu Aug 29 21:25:48 2019 -0700
tree cab175d9090dacfb5183ac30abf3339e6e3e7489
parent 496058f59937da478eb172c864502b5dcf67705b

bpo-37976: Prevent shadowing of TypeError in zip() (GH-15592)

Lib/test/test_itertools.py

diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 573739f..98b8c83 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -971,6 +971,18 @@
             self.pickletest(proto, zip_longest("abc", "defgh", fillvalue=1))
             self.pickletest(proto, zip_longest("", "defgh"))
 
+    def test_zip_longest_bad_iterable(self):
+        exception = TypeError()
+
+        class BadIterable:
+            def __iter__(self):
+                raise exception
+
+        with self.assertRaises(TypeError) as cm:
+            zip_longest(BadIterable())
+
+        self.assertIs(cm.exception, exception)
+
     def test_bug_7244(self):
 
         class Repeater: