From 5075416b8fedc5526b643dabc915f7945fa0d969 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Thu, 3 Aug 2017 11:45:23 +0300
Subject: bpo-30978: str.format_map() now passes key lookup exceptions through.
 (#2790)

Previously any exception was replaced with a KeyError exception.
---
 Lib/test/test_unicode.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'Lib/test/test_unicode.py')

diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 506f0715c2e..341007b6507 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1278,6 +1278,13 @@ class UnicodeTest(string_tests.CommonTest,
         self.assertRaises(ValueError, '{}'.format_map, 'a')
         self.assertRaises(ValueError, '{a} {}'.format_map, {"a" : 2, "b" : 1})
 
+        class BadMapping:
+            def __getitem__(self, key):
+                return 1/0
+        self.assertRaises(KeyError, '{a}'.format_map, {})
+        self.assertRaises(TypeError, '{a}'.format_map, [])
+        self.assertRaises(ZeroDivisionError, '{a}'.format_map, BadMapping())
+
     def test_format_huge_precision(self):
         format_string = ".{}f".format(sys.maxsize + 1)
         with self.assertRaises(ValueError):
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