From: Raymond Hettinger <python@rcn.com>
Date: Wed, 14 Nov 2007 23:02:30 +0000 (+0000)
Subject: Add test for __fields__ being read-only
X-Git-Tag: v2.6a1~1056
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b5e5d0741a7a9b8219abac143e06f40b804886c9;p=python

Add test for __fields__ being read-only
---

diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 348919f42d..04d4d9d246 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -43,6 +43,14 @@ class TestNamedTuple(unittest.TestCase):
         self.assertEqual(p.__replace__('x', 1), (1, 22))                    # test __replace__ method
         self.assertEqual(p.__asdict__(), dict(x=11, y=22))                  # test __dict__ method
 
+        # Verify that __fields__ is read-only
+        try:
+            p.__fields__ = ('F1' ,'F2')
+        except AttributeError:
+            pass
+        else:
+            self.fail('The __fields__ attribute needs to be read-only')
+
         # verify that field string can have commas
         Point = namedtuple('Point', 'x, y')
         p = Point(x=11, y=22)