[Python-checkins] bpo-9495: avoid confusing chained exception in argparse test (GH-17120)

[alclarks]

https://github.com/python/cpython/commit/d4331c56b4f6fe6f18caf19fc1ecf9fec14f7066
commit: d4331c56b4f6fe6f18caf19fc1ecf9fec14f7066
branch: master
author: alclarks <57201106+alclarks at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2020-02-21T10:48:36+02:00
summary:

bpo-9495: avoid confusing chained exception in argparse test (GH-17120)

files:
M Lib/test/test_argparse.py
M Misc/ACKS

diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index b095783a02e1e..9899a53d6d197 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -105,7 +105,8 @@ def stderr_to_parser_error(parse_args, *args, **kwargs):
             code = sys.exc_info()[1].code
             stdout = sys.stdout.getvalue()
             stderr = sys.stderr.getvalue()
-            raise ArgumentParserError("SystemExit", stdout, stderr, code)
+            raise ArgumentParserError(
+                "SystemExit", stdout, stderr, code) from None
     finally:
         sys.stdout = old_stdout
         sys.stderr = old_stderr
diff --git a/Misc/ACKS b/Misc/ACKS
index b11ee9cdea67d..976c26eb9117b 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -312,6 +312,7 @@ Gilles Civario
 Chris Clark
 Diana Clarke
 Laurie Clark-Michalek
+Alexander Clarkson
 Mike Clarkson
 Andrew Clegg
 Brad Clements