From aa32a7e1116f7aaaef9fec453db910e90ab7b101 Mon Sep 17 00:00:00 2001
From: Batuhan Taşkaya <47358913+isidentical@users.noreply.github.com>
Date: Tue, 21 May 2019 20:47:42 +0300
Subject: bpo-23378: Add an extend action to argparse (GH-13305)

Add an extend action to argparse


https://bugs.python.org/issue23378
---
 Lib/argparse.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'Lib/argparse.py')

diff --git a/Lib/argparse.py b/Lib/argparse.py
index 798766f6c40..ef888f063b3 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1154,6 +1154,12 @@ class _SubParsersAction(Action):
             vars(namespace).setdefault(_UNRECOGNIZED_ARGS_ATTR, [])
             getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)
 
+class _ExtendAction(_AppendAction):
+    def __call__(self, parser, namespace, values, option_string=None):
+        items = getattr(namespace, self.dest, None)
+        items = _copy_items(items)
+        items.extend(values)
+        setattr(namespace, self.dest, items)
 
 # ==============
 # Type classes
@@ -1262,6 +1268,7 @@ class _ActionsContainer(object):
         self.register('action', 'help', _HelpAction)
         self.register('action', 'version', _VersionAction)
         self.register('action', 'parsers', _SubParsersAction)
+        self.register('action', 'extend', _ExtendAction)
 
         # raise an exception if the conflict handler is invalid
         self._get_handler()
-- 
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