commit 55c206ab2f2c8f0385dcc71054b3b42c3958b896
author Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> Sun Sep 02 14:59:19 2012 +0200
committer Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> Sun Sep 02 14:59:19 2012 +0200
tree dec2edf36252cceda3483acbfaf1e2a03f6f2d80
parent af3f3a7f00cdf34aaba239021e38b8ede9a107fb

Fix bug with argparse.Parser.parse_args(*args)

Lib/argparse.py

diff --git a/Lib/argparse.py b/Lib/argparse.py
index cc3e374..67bbef2 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1709,9 +1709,12 @@
         return args
 
     def parse_known_args(self, args=None, namespace=None):
-        # args default to the system args
         if args is None:
+            # args default to the system args
             args = _sys.argv[1:]
+        else:
+            # make sure that args are mutable
+            args = list(args)
 
         # default Namespace built from parser defaults
         if namespace is None: