- Issue #15906: Fix a regression in argparse caused by the preceding change,
when action='append', type='str' and default=[].
diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index a2f9a69..cd80dc6 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -4516,6 +4516,16 @@
args = parser.parse_args([])
self.assertEqual(NS(foo='foo_converted'), args)
+ def test_issue_15906(self):
+ # Issue #15906: When action='append', type=str, default=[] are
+ # providing, the dest value was the string representation "[]" when it
+ # should have been an empty list.
+ parser = argparse.ArgumentParser()
+ parser.add_argument('--test', dest='test', type=str,
+ default=[], action='append')
+ args = parser.parse_args([])
+ self.assertEqual(args.test, [])
+
# ======================
# parse_known_args tests
# ======================